1bae9a0aaSDmitry Fomichev // SPDX-License-Identifier: GPL-2.0-only 23b1a94c8SDamien Le Moal /* 33b1a94c8SDamien Le Moal * Copyright (C) 2017 Western Digital Corporation or its affiliates. 43b1a94c8SDamien Le Moal * 53b1a94c8SDamien Le Moal * This file is released under the GPL. 63b1a94c8SDamien Le Moal */ 73b1a94c8SDamien Le Moal 83b1a94c8SDamien Le Moal #include "dm-zoned.h" 93b1a94c8SDamien Le Moal 103b1a94c8SDamien Le Moal #include <linux/module.h> 113b1a94c8SDamien Le Moal #include <linux/crc32.h> 12bd976e52SDamien Le Moal #include <linux/sched/mm.h> 133b1a94c8SDamien Le Moal 143b1a94c8SDamien Le Moal #define DM_MSG_PREFIX "zoned metadata" 153b1a94c8SDamien Le Moal 163b1a94c8SDamien Le Moal /* 173b1a94c8SDamien Le Moal * Metadata version. 183b1a94c8SDamien Le Moal */ 19bd5c4031SHannes Reinecke #define DMZ_META_VER 2 203b1a94c8SDamien Le Moal 213b1a94c8SDamien Le Moal /* 223b1a94c8SDamien Le Moal * On-disk super block magic. 233b1a94c8SDamien Le Moal */ 243b1a94c8SDamien Le Moal #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ 253b1a94c8SDamien Le Moal (((unsigned int)('Z')) << 16) | \ 263b1a94c8SDamien Le Moal (((unsigned int)('B')) << 8) | \ 273b1a94c8SDamien Le Moal ((unsigned int)('D'))) 283b1a94c8SDamien Le Moal 293b1a94c8SDamien Le Moal /* 303b1a94c8SDamien Le Moal * On disk super block. 313b1a94c8SDamien Le Moal * This uses only 512 B but uses on disk a full 4KB block. This block is 323b1a94c8SDamien Le Moal * followed on disk by the mapping table of chunks to zones and the bitmap 333b1a94c8SDamien Le Moal * blocks indicating zone block validity. 343b1a94c8SDamien Le Moal * The overall resulting metadata format is: 353b1a94c8SDamien Le Moal * (1) Super block (1 block) 363b1a94c8SDamien Le Moal * (2) Chunk mapping table (nr_map_blocks) 373b1a94c8SDamien Le Moal * (3) Bitmap blocks (nr_bitmap_blocks) 38ad1bd578SDmitry Fomichev * All metadata blocks are stored in conventional zones, starting from 393b1a94c8SDamien Le Moal * the first conventional zone found on disk. 403b1a94c8SDamien Le Moal */ 413b1a94c8SDamien Le Moal struct dmz_super { 423b1a94c8SDamien Le Moal /* Magic number */ 433b1a94c8SDamien Le Moal __le32 magic; /* 4 */ 443b1a94c8SDamien Le Moal 453b1a94c8SDamien Le Moal /* Metadata version number */ 463b1a94c8SDamien Le Moal __le32 version; /* 8 */ 473b1a94c8SDamien Le Moal 483b1a94c8SDamien Le Moal /* Generation number */ 493b1a94c8SDamien Le Moal __le64 gen; /* 16 */ 503b1a94c8SDamien Le Moal 513b1a94c8SDamien Le Moal /* This block number */ 523b1a94c8SDamien Le Moal __le64 sb_block; /* 24 */ 533b1a94c8SDamien Le Moal 543b1a94c8SDamien Le Moal /* The number of metadata blocks, including this super block */ 553b1a94c8SDamien Le Moal __le32 nr_meta_blocks; /* 28 */ 563b1a94c8SDamien Le Moal 573b1a94c8SDamien Le Moal /* The number of sequential zones reserved for reclaim */ 583b1a94c8SDamien Le Moal __le32 nr_reserved_seq; /* 32 */ 593b1a94c8SDamien Le Moal 603b1a94c8SDamien Le Moal /* The number of entries in the mapping table */ 613b1a94c8SDamien Le Moal __le32 nr_chunks; /* 36 */ 623b1a94c8SDamien Le Moal 633b1a94c8SDamien Le Moal /* The number of blocks used for the chunk mapping table */ 643b1a94c8SDamien Le Moal __le32 nr_map_blocks; /* 40 */ 653b1a94c8SDamien Le Moal 663b1a94c8SDamien Le Moal /* The number of blocks used for the block bitmaps */ 673b1a94c8SDamien Le Moal __le32 nr_bitmap_blocks; /* 44 */ 683b1a94c8SDamien Le Moal 693b1a94c8SDamien Le Moal /* Checksum */ 703b1a94c8SDamien Le Moal __le32 crc; /* 48 */ 713b1a94c8SDamien Le Moal 72bd5c4031SHannes Reinecke /* DM-Zoned label */ 73bd5c4031SHannes Reinecke u8 dmz_label[32]; /* 80 */ 74bd5c4031SHannes Reinecke 75bd5c4031SHannes Reinecke /* DM-Zoned UUID */ 76bd5c4031SHannes Reinecke u8 dmz_uuid[16]; /* 96 */ 77bd5c4031SHannes Reinecke 78bd5c4031SHannes Reinecke /* Device UUID */ 79bd5c4031SHannes Reinecke u8 dev_uuid[16]; /* 112 */ 80bd5c4031SHannes Reinecke 813b1a94c8SDamien Le Moal /* Padding to full 512B sector */ 82bd5c4031SHannes Reinecke u8 reserved[400]; /* 512 */ 833b1a94c8SDamien Le Moal }; 843b1a94c8SDamien Le Moal 853b1a94c8SDamien Le Moal /* 863b1a94c8SDamien Le Moal * Chunk mapping entry: entries are indexed by chunk number 873b1a94c8SDamien Le Moal * and give the zone ID (dzone_id) mapping the chunk on disk. 883b1a94c8SDamien Le Moal * This zone may be sequential or random. If it is a sequential 893b1a94c8SDamien Le Moal * zone, a second zone (bzone_id) used as a write buffer may 903b1a94c8SDamien Le Moal * also be specified. This second zone will always be a randomly 913b1a94c8SDamien Le Moal * writeable zone. 923b1a94c8SDamien Le Moal */ 933b1a94c8SDamien Le Moal struct dmz_map { 943b1a94c8SDamien Le Moal __le32 dzone_id; 953b1a94c8SDamien Le Moal __le32 bzone_id; 963b1a94c8SDamien Le Moal }; 973b1a94c8SDamien Le Moal 983b1a94c8SDamien Le Moal /* 993b1a94c8SDamien Le Moal * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. 1003b1a94c8SDamien Le Moal */ 1013b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) 1023b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) 1033b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) 1043b1a94c8SDamien Le Moal #define DMZ_MAP_UNMAPPED UINT_MAX 1053b1a94c8SDamien Le Moal 1063b1a94c8SDamien Le Moal /* 1073b1a94c8SDamien Le Moal * Meta data block descriptor (for cached metadata blocks). 1083b1a94c8SDamien Le Moal */ 1093b1a94c8SDamien Le Moal struct dmz_mblock { 1103b1a94c8SDamien Le Moal struct rb_node node; 1113b1a94c8SDamien Le Moal struct list_head link; 1123b1a94c8SDamien Le Moal sector_t no; 11333c2865fSDamien Le Moal unsigned int ref; 1143b1a94c8SDamien Le Moal unsigned long state; 1153b1a94c8SDamien Le Moal struct page *page; 1163b1a94c8SDamien Le Moal void *data; 1173b1a94c8SDamien Le Moal }; 1183b1a94c8SDamien Le Moal 1193b1a94c8SDamien Le Moal /* 1203b1a94c8SDamien Le Moal * Metadata block state flags. 1213b1a94c8SDamien Le Moal */ 1223b1a94c8SDamien Le Moal enum { 1233b1a94c8SDamien Le Moal DMZ_META_DIRTY, 1243b1a94c8SDamien Le Moal DMZ_META_READING, 1253b1a94c8SDamien Le Moal DMZ_META_WRITING, 1263b1a94c8SDamien Le Moal DMZ_META_ERROR, 1273b1a94c8SDamien Le Moal }; 1283b1a94c8SDamien Le Moal 1293b1a94c8SDamien Le Moal /* 1303b1a94c8SDamien Le Moal * Super block information (one per metadata set). 1313b1a94c8SDamien Le Moal */ 1323b1a94c8SDamien Le Moal struct dmz_sb { 1333b1a94c8SDamien Le Moal sector_t block; 134bf28a3baSHannes Reinecke struct dmz_dev *dev; 1353b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 1363b1a94c8SDamien Le Moal struct dmz_super *sb; 137735bd7e4SHannes Reinecke struct dm_zone *zone; 1383b1a94c8SDamien Le Moal }; 1393b1a94c8SDamien Le Moal 1403b1a94c8SDamien Le Moal /* 1413b1a94c8SDamien Le Moal * In-memory metadata. 1423b1a94c8SDamien Le Moal */ 1433b1a94c8SDamien Le Moal struct dmz_metadata { 1443b1a94c8SDamien Le Moal struct dmz_dev *dev; 145bd5c4031SHannes Reinecke unsigned int nr_devs; 1463b1a94c8SDamien Le Moal 1472234e732SHannes Reinecke char devname[BDEVNAME_SIZE]; 148bd5c4031SHannes Reinecke char label[BDEVNAME_SIZE]; 149bd5c4031SHannes Reinecke uuid_t uuid; 1502234e732SHannes Reinecke 1513b1a94c8SDamien Le Moal sector_t zone_bitmap_size; 1523b1a94c8SDamien Le Moal unsigned int zone_nr_bitmap_blocks; 153b3996295SDmitry Fomichev unsigned int zone_bits_per_mblk; 1543b1a94c8SDamien Le Moal 15536820560SHannes Reinecke sector_t zone_nr_blocks; 15636820560SHannes Reinecke sector_t zone_nr_blocks_shift; 15736820560SHannes Reinecke 15836820560SHannes Reinecke sector_t zone_nr_sectors; 15936820560SHannes Reinecke sector_t zone_nr_sectors_shift; 16036820560SHannes Reinecke 1613b1a94c8SDamien Le Moal unsigned int nr_bitmap_blocks; 1623b1a94c8SDamien Le Moal unsigned int nr_map_blocks; 1633b1a94c8SDamien Le Moal 16436820560SHannes Reinecke unsigned int nr_zones; 1653b1a94c8SDamien Le Moal unsigned int nr_useable_zones; 1663b1a94c8SDamien Le Moal unsigned int nr_meta_blocks; 1673b1a94c8SDamien Le Moal unsigned int nr_meta_zones; 1683b1a94c8SDamien Le Moal unsigned int nr_data_zones; 1693b1a94c8SDamien Le Moal unsigned int nr_rnd_zones; 1703b1a94c8SDamien Le Moal unsigned int nr_reserved_seq; 1713b1a94c8SDamien Le Moal unsigned int nr_chunks; 1723b1a94c8SDamien Le Moal 1733b1a94c8SDamien Le Moal /* Zone information array */ 1743b1a94c8SDamien Le Moal struct dm_zone *zones; 1753b1a94c8SDamien Le Moal 176bd5c4031SHannes Reinecke struct dmz_sb sb[3]; 1773b1a94c8SDamien Le Moal unsigned int mblk_primary; 178bd5c4031SHannes Reinecke unsigned int sb_version; 1793b1a94c8SDamien Le Moal u64 sb_gen; 1803b1a94c8SDamien Le Moal unsigned int min_nr_mblks; 1813b1a94c8SDamien Le Moal unsigned int max_nr_mblks; 1823b1a94c8SDamien Le Moal atomic_t nr_mblks; 1833b1a94c8SDamien Le Moal struct rw_semaphore mblk_sem; 1843b1a94c8SDamien Le Moal struct mutex mblk_flush_lock; 1853b1a94c8SDamien Le Moal spinlock_t mblk_lock; 1863b1a94c8SDamien Le Moal struct rb_root mblk_rbtree; 1873b1a94c8SDamien Le Moal struct list_head mblk_lru_list; 1883b1a94c8SDamien Le Moal struct list_head mblk_dirty_list; 1893b1a94c8SDamien Le Moal struct shrinker mblk_shrinker; 1903b1a94c8SDamien Le Moal 1913b1a94c8SDamien Le Moal /* Zone allocation management */ 1923b1a94c8SDamien Le Moal struct mutex map_lock; 1933b1a94c8SDamien Le Moal struct dmz_mblock **map_mblk; 1943b1a94c8SDamien Le Moal unsigned int nr_rnd; 1953b1a94c8SDamien Le Moal atomic_t unmap_nr_rnd; 1963b1a94c8SDamien Le Moal struct list_head unmap_rnd_list; 1973b1a94c8SDamien Le Moal struct list_head map_rnd_list; 1983b1a94c8SDamien Le Moal 1993b1a94c8SDamien Le Moal unsigned int nr_seq; 2003b1a94c8SDamien Le Moal atomic_t unmap_nr_seq; 2013b1a94c8SDamien Le Moal struct list_head unmap_seq_list; 2023b1a94c8SDamien Le Moal struct list_head map_seq_list; 2033b1a94c8SDamien Le Moal 2043b1a94c8SDamien Le Moal atomic_t nr_reserved_seq_zones; 2053b1a94c8SDamien Le Moal struct list_head reserved_seq_zones_list; 2063b1a94c8SDamien Le Moal 2073b1a94c8SDamien Le Moal wait_queue_head_t free_wq; 2083b1a94c8SDamien Le Moal }; 2093b1a94c8SDamien Le Moal 210ca1a7045SHannes Reinecke #define dmz_zmd_info(zmd, format, args...) \ 211bd5c4031SHannes Reinecke DMINFO("(%s): " format, (zmd)->label, ## args) 212ca1a7045SHannes Reinecke 213ca1a7045SHannes Reinecke #define dmz_zmd_err(zmd, format, args...) \ 214bd5c4031SHannes Reinecke DMERR("(%s): " format, (zmd)->label, ## args) 215ca1a7045SHannes Reinecke 216ca1a7045SHannes Reinecke #define dmz_zmd_warn(zmd, format, args...) \ 217bd5c4031SHannes Reinecke DMWARN("(%s): " format, (zmd)->label, ## args) 218ca1a7045SHannes Reinecke 219ca1a7045SHannes Reinecke #define dmz_zmd_debug(zmd, format, args...) \ 220bd5c4031SHannes Reinecke DMDEBUG("(%s): " format, (zmd)->label, ## args) 2213b1a94c8SDamien Le Moal /* 2223b1a94c8SDamien Le Moal * Various accessors 2233b1a94c8SDamien Le Moal */ 224bd5c4031SHannes Reinecke static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) 225bd5c4031SHannes Reinecke { 226bd5c4031SHannes Reinecke unsigned int zone_id; 227bd5c4031SHannes Reinecke 228bd5c4031SHannes Reinecke if (WARN_ON(!zone)) 229bd5c4031SHannes Reinecke return 0; 230bd5c4031SHannes Reinecke 231bd5c4031SHannes Reinecke zone_id = zone->id; 232bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && 233bd5c4031SHannes Reinecke (zone_id >= zmd->dev[1].zone_offset)) 234bd5c4031SHannes Reinecke zone_id -= zmd->dev[1].zone_offset; 235bd5c4031SHannes Reinecke return zone_id; 236bd5c4031SHannes Reinecke } 237bd5c4031SHannes Reinecke 2383b1a94c8SDamien Le Moal sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) 2393b1a94c8SDamien Le Moal { 240bd5c4031SHannes Reinecke unsigned int zone_id = dmz_dev_zone_id(zmd, zone); 241bd5c4031SHannes Reinecke 242bd5c4031SHannes Reinecke return (sector_t)zone_id << zmd->zone_nr_sectors_shift; 2433b1a94c8SDamien Le Moal } 2443b1a94c8SDamien Le Moal 2453b1a94c8SDamien Le Moal sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) 2463b1a94c8SDamien Le Moal { 247bd5c4031SHannes Reinecke unsigned int zone_id = dmz_dev_zone_id(zmd, zone); 248bd5c4031SHannes Reinecke 249bd5c4031SHannes Reinecke return (sector_t)zone_id << zmd->zone_nr_blocks_shift; 2503b1a94c8SDamien Le Moal } 2513b1a94c8SDamien Le Moal 252bf28a3baSHannes Reinecke struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone) 253bf28a3baSHannes Reinecke { 254bd5c4031SHannes Reinecke if (WARN_ON(!zone)) 255bd5c4031SHannes Reinecke return &zmd->dev[0]; 256bd5c4031SHannes Reinecke 257bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && 258bd5c4031SHannes Reinecke zone->id >= zmd->dev[1].zone_offset) 259bd5c4031SHannes Reinecke return &zmd->dev[1]; 260bd5c4031SHannes Reinecke 261bf28a3baSHannes Reinecke return &zmd->dev[0]; 262bf28a3baSHannes Reinecke } 263bf28a3baSHannes Reinecke 26436820560SHannes Reinecke unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd) 26536820560SHannes Reinecke { 26636820560SHannes Reinecke return zmd->zone_nr_blocks; 26736820560SHannes Reinecke } 26836820560SHannes Reinecke 26936820560SHannes Reinecke unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd) 27036820560SHannes Reinecke { 27136820560SHannes Reinecke return zmd->zone_nr_blocks_shift; 27236820560SHannes Reinecke } 27336820560SHannes Reinecke 27436820560SHannes Reinecke unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd) 27536820560SHannes Reinecke { 27636820560SHannes Reinecke return zmd->zone_nr_sectors; 27736820560SHannes Reinecke } 27836820560SHannes Reinecke 27936820560SHannes Reinecke unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd) 28036820560SHannes Reinecke { 28136820560SHannes Reinecke return zmd->zone_nr_sectors_shift; 28236820560SHannes Reinecke } 28336820560SHannes Reinecke 284bc3d5717SHannes Reinecke unsigned int dmz_nr_zones(struct dmz_metadata *zmd) 285bc3d5717SHannes Reinecke { 28636820560SHannes Reinecke return zmd->nr_zones; 287bc3d5717SHannes Reinecke } 288bc3d5717SHannes Reinecke 2893b1a94c8SDamien Le Moal unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) 2903b1a94c8SDamien Le Moal { 2913b1a94c8SDamien Le Moal return zmd->nr_chunks; 2923b1a94c8SDamien Le Moal } 2933b1a94c8SDamien Le Moal 2943b1a94c8SDamien Le Moal unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) 2953b1a94c8SDamien Le Moal { 2963b1a94c8SDamien Le Moal return zmd->nr_rnd; 2973b1a94c8SDamien Le Moal } 2983b1a94c8SDamien Le Moal 2993b1a94c8SDamien Le Moal unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) 3003b1a94c8SDamien Le Moal { 3013b1a94c8SDamien Le Moal return atomic_read(&zmd->unmap_nr_rnd); 3023b1a94c8SDamien Le Moal } 3033b1a94c8SDamien Le Moal 304bc3d5717SHannes Reinecke unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd) 305bc3d5717SHannes Reinecke { 306bc3d5717SHannes Reinecke return zmd->nr_seq; 307bc3d5717SHannes Reinecke } 308bc3d5717SHannes Reinecke 309bc3d5717SHannes Reinecke unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd) 310bc3d5717SHannes Reinecke { 311bc3d5717SHannes Reinecke return atomic_read(&zmd->unmap_nr_seq); 312bc3d5717SHannes Reinecke } 313bc3d5717SHannes Reinecke 3142234e732SHannes Reinecke const char *dmz_metadata_label(struct dmz_metadata *zmd) 3152234e732SHannes Reinecke { 316bd5c4031SHannes Reinecke return (const char *)zmd->label; 3172234e732SHannes Reinecke } 3182234e732SHannes Reinecke 319d0e21ce4SHannes Reinecke bool dmz_check_dev(struct dmz_metadata *zmd) 320d0e21ce4SHannes Reinecke { 321bd5c4031SHannes Reinecke unsigned int i; 322bd5c4031SHannes Reinecke 323bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) { 324bd5c4031SHannes Reinecke if (!dmz_check_bdev(&zmd->dev[i])) 325bd5c4031SHannes Reinecke return false; 326bd5c4031SHannes Reinecke } 327bd5c4031SHannes Reinecke return true; 328d0e21ce4SHannes Reinecke } 329d0e21ce4SHannes Reinecke 330d0e21ce4SHannes Reinecke bool dmz_dev_is_dying(struct dmz_metadata *zmd) 331d0e21ce4SHannes Reinecke { 332bd5c4031SHannes Reinecke unsigned int i; 333bd5c4031SHannes Reinecke 334bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) { 335bd5c4031SHannes Reinecke if (dmz_bdev_is_dying(&zmd->dev[i])) 336bd5c4031SHannes Reinecke return true; 337bd5c4031SHannes Reinecke } 338bd5c4031SHannes Reinecke return false; 339d0e21ce4SHannes Reinecke } 340d0e21ce4SHannes Reinecke 3413b1a94c8SDamien Le Moal /* 3423b1a94c8SDamien Le Moal * Lock/unlock mapping table. 3433b1a94c8SDamien Le Moal * The map lock also protects all the zone lists. 3443b1a94c8SDamien Le Moal */ 3453b1a94c8SDamien Le Moal void dmz_lock_map(struct dmz_metadata *zmd) 3463b1a94c8SDamien Le Moal { 3473b1a94c8SDamien Le Moal mutex_lock(&zmd->map_lock); 3483b1a94c8SDamien Le Moal } 3493b1a94c8SDamien Le Moal 3503b1a94c8SDamien Le Moal void dmz_unlock_map(struct dmz_metadata *zmd) 3513b1a94c8SDamien Le Moal { 3523b1a94c8SDamien Le Moal mutex_unlock(&zmd->map_lock); 3533b1a94c8SDamien Le Moal } 3543b1a94c8SDamien Le Moal 3553b1a94c8SDamien Le Moal /* 3563b1a94c8SDamien Le Moal * Lock/unlock metadata access. This is a "read" lock on a semaphore 3573b1a94c8SDamien Le Moal * that prevents metadata flush from running while metadata are being 3583b1a94c8SDamien Le Moal * modified. The actual metadata write mutual exclusion is achieved with 359ad1bd578SDmitry Fomichev * the map lock and zone state management (active and reclaim state are 3603b1a94c8SDamien Le Moal * mutually exclusive). 3613b1a94c8SDamien Le Moal */ 3623b1a94c8SDamien Le Moal void dmz_lock_metadata(struct dmz_metadata *zmd) 3633b1a94c8SDamien Le Moal { 3643b1a94c8SDamien Le Moal down_read(&zmd->mblk_sem); 3653b1a94c8SDamien Le Moal } 3663b1a94c8SDamien Le Moal 3673b1a94c8SDamien Le Moal void dmz_unlock_metadata(struct dmz_metadata *zmd) 3683b1a94c8SDamien Le Moal { 3693b1a94c8SDamien Le Moal up_read(&zmd->mblk_sem); 3703b1a94c8SDamien Le Moal } 3713b1a94c8SDamien Le Moal 3723b1a94c8SDamien Le Moal /* 3733b1a94c8SDamien Le Moal * Lock/unlock flush: prevent concurrent executions 3743b1a94c8SDamien Le Moal * of dmz_flush_metadata as well as metadata modification in reclaim 3753b1a94c8SDamien Le Moal * while flush is being executed. 3763b1a94c8SDamien Le Moal */ 3773b1a94c8SDamien Le Moal void dmz_lock_flush(struct dmz_metadata *zmd) 3783b1a94c8SDamien Le Moal { 3793b1a94c8SDamien Le Moal mutex_lock(&zmd->mblk_flush_lock); 3803b1a94c8SDamien Le Moal } 3813b1a94c8SDamien Le Moal 3823b1a94c8SDamien Le Moal void dmz_unlock_flush(struct dmz_metadata *zmd) 3833b1a94c8SDamien Le Moal { 3843b1a94c8SDamien Le Moal mutex_unlock(&zmd->mblk_flush_lock); 3853b1a94c8SDamien Le Moal } 3863b1a94c8SDamien Le Moal 3873b1a94c8SDamien Le Moal /* 3883b1a94c8SDamien Le Moal * Allocate a metadata block. 3893b1a94c8SDamien Le Moal */ 3903b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, 3913b1a94c8SDamien Le Moal sector_t mblk_no) 3923b1a94c8SDamien Le Moal { 3933b1a94c8SDamien Le Moal struct dmz_mblock *mblk = NULL; 3943b1a94c8SDamien Le Moal 3953b1a94c8SDamien Le Moal /* See if we can reuse cached blocks */ 3963b1a94c8SDamien Le Moal if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { 3973b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 3983b1a94c8SDamien Le Moal mblk = list_first_entry_or_null(&zmd->mblk_lru_list, 3993b1a94c8SDamien Le Moal struct dmz_mblock, link); 4003b1a94c8SDamien Le Moal if (mblk) { 4013b1a94c8SDamien Le Moal list_del_init(&mblk->link); 4023b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 4033b1a94c8SDamien Le Moal mblk->no = mblk_no; 4043b1a94c8SDamien Le Moal } 4053b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 4063b1a94c8SDamien Le Moal if (mblk) 4073b1a94c8SDamien Le Moal return mblk; 4083b1a94c8SDamien Le Moal } 4093b1a94c8SDamien Le Moal 4103b1a94c8SDamien Le Moal /* Allocate a new block */ 4113b1a94c8SDamien Le Moal mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); 4123b1a94c8SDamien Le Moal if (!mblk) 4133b1a94c8SDamien Le Moal return NULL; 4143b1a94c8SDamien Le Moal 4153b1a94c8SDamien Le Moal mblk->page = alloc_page(GFP_NOIO); 4163b1a94c8SDamien Le Moal if (!mblk->page) { 4173b1a94c8SDamien Le Moal kfree(mblk); 4183b1a94c8SDamien Le Moal return NULL; 4193b1a94c8SDamien Le Moal } 4203b1a94c8SDamien Le Moal 4213b1a94c8SDamien Le Moal RB_CLEAR_NODE(&mblk->node); 4223b1a94c8SDamien Le Moal INIT_LIST_HEAD(&mblk->link); 42333c2865fSDamien Le Moal mblk->ref = 0; 4243b1a94c8SDamien Le Moal mblk->state = 0; 4253b1a94c8SDamien Le Moal mblk->no = mblk_no; 4263b1a94c8SDamien Le Moal mblk->data = page_address(mblk->page); 4273b1a94c8SDamien Le Moal 4283b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_mblks); 4293b1a94c8SDamien Le Moal 4303b1a94c8SDamien Le Moal return mblk; 4313b1a94c8SDamien Le Moal } 4323b1a94c8SDamien Le Moal 4333b1a94c8SDamien Le Moal /* 4343b1a94c8SDamien Le Moal * Free a metadata block. 4353b1a94c8SDamien Le Moal */ 4363b1a94c8SDamien Le Moal static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 4373b1a94c8SDamien Le Moal { 4383b1a94c8SDamien Le Moal __free_pages(mblk->page, 0); 4393b1a94c8SDamien Le Moal kfree(mblk); 4403b1a94c8SDamien Le Moal 4413b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_mblks); 4423b1a94c8SDamien Le Moal } 4433b1a94c8SDamien Le Moal 4443b1a94c8SDamien Le Moal /* 4453b1a94c8SDamien Le Moal * Insert a metadata block in the rbtree. 4463b1a94c8SDamien Le Moal */ 4473b1a94c8SDamien Le Moal static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 4483b1a94c8SDamien Le Moal { 4493b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 4503b1a94c8SDamien Le Moal struct rb_node **new = &(root->rb_node), *parent = NULL; 4513b1a94c8SDamien Le Moal struct dmz_mblock *b; 4523b1a94c8SDamien Le Moal 4533b1a94c8SDamien Le Moal /* Figure out where to put the new node */ 4543b1a94c8SDamien Le Moal while (*new) { 4553b1a94c8SDamien Le Moal b = container_of(*new, struct dmz_mblock, node); 4563b1a94c8SDamien Le Moal parent = *new; 4573b1a94c8SDamien Le Moal new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); 4583b1a94c8SDamien Le Moal } 4593b1a94c8SDamien Le Moal 4603b1a94c8SDamien Le Moal /* Add new node and rebalance tree */ 4613b1a94c8SDamien Le Moal rb_link_node(&mblk->node, parent, new); 4623b1a94c8SDamien Le Moal rb_insert_color(&mblk->node, root); 4633b1a94c8SDamien Le Moal } 4643b1a94c8SDamien Le Moal 4653b1a94c8SDamien Le Moal /* 4663d4e7383SDamien Le Moal * Lookup a metadata block in the rbtree. If the block is found, increment 4673d4e7383SDamien Le Moal * its reference count. 4683b1a94c8SDamien Le Moal */ 4693d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, 4703b1a94c8SDamien Le Moal sector_t mblk_no) 4713b1a94c8SDamien Le Moal { 4723b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 4733b1a94c8SDamien Le Moal struct rb_node *node = root->rb_node; 4743b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 4753b1a94c8SDamien Le Moal 4763b1a94c8SDamien Le Moal while (node) { 4773b1a94c8SDamien Le Moal mblk = container_of(node, struct dmz_mblock, node); 4783d4e7383SDamien Le Moal if (mblk->no == mblk_no) { 4793d4e7383SDamien Le Moal /* 4803d4e7383SDamien Le Moal * If this is the first reference to the block, 4813d4e7383SDamien Le Moal * remove it from the LRU list. 4823d4e7383SDamien Le Moal */ 4833d4e7383SDamien Le Moal mblk->ref++; 4843d4e7383SDamien Le Moal if (mblk->ref == 1 && 4853d4e7383SDamien Le Moal !test_bit(DMZ_META_DIRTY, &mblk->state)) 4863d4e7383SDamien Le Moal list_del_init(&mblk->link); 4873b1a94c8SDamien Le Moal return mblk; 4883d4e7383SDamien Le Moal } 4893b1a94c8SDamien Le Moal node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; 4903b1a94c8SDamien Le Moal } 4913b1a94c8SDamien Le Moal 4923b1a94c8SDamien Le Moal return NULL; 4933b1a94c8SDamien Le Moal } 4943b1a94c8SDamien Le Moal 4953b1a94c8SDamien Le Moal /* 4963b1a94c8SDamien Le Moal * Metadata block BIO end callback. 4973b1a94c8SDamien Le Moal */ 4983b1a94c8SDamien Le Moal static void dmz_mblock_bio_end_io(struct bio *bio) 4993b1a94c8SDamien Le Moal { 5003b1a94c8SDamien Le Moal struct dmz_mblock *mblk = bio->bi_private; 5013b1a94c8SDamien Le Moal int flag; 5023b1a94c8SDamien Le Moal 5033b1a94c8SDamien Le Moal if (bio->bi_status) 5043b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 5053b1a94c8SDamien Le Moal 5063b1a94c8SDamien Le Moal if (bio_op(bio) == REQ_OP_WRITE) 5073b1a94c8SDamien Le Moal flag = DMZ_META_WRITING; 5083b1a94c8SDamien Le Moal else 5093b1a94c8SDamien Le Moal flag = DMZ_META_READING; 5103b1a94c8SDamien Le Moal 5113b1a94c8SDamien Le Moal clear_bit_unlock(flag, &mblk->state); 5123b1a94c8SDamien Le Moal smp_mb__after_atomic(); 5133b1a94c8SDamien Le Moal wake_up_bit(&mblk->state, flag); 5143b1a94c8SDamien Le Moal 5153b1a94c8SDamien Le Moal bio_put(bio); 5163b1a94c8SDamien Le Moal } 5173b1a94c8SDamien Le Moal 5183b1a94c8SDamien Le Moal /* 5193d4e7383SDamien Le Moal * Read an uncached metadata block from disk and add it to the cache. 5203b1a94c8SDamien Le Moal */ 5213d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, 5223b1a94c8SDamien Le Moal sector_t mblk_no) 5233b1a94c8SDamien Le Moal { 5243d4e7383SDamien Le Moal struct dmz_mblock *mblk, *m; 5253b1a94c8SDamien Le Moal sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; 526bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; 5273b1a94c8SDamien Le Moal struct bio *bio; 5283b1a94c8SDamien Le Moal 529bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 53075d66ffbSDmitry Fomichev return ERR_PTR(-EIO); 53175d66ffbSDmitry Fomichev 5323d4e7383SDamien Le Moal /* Get a new block and a BIO to read it */ 5333b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, mblk_no); 5343b1a94c8SDamien Le Moal if (!mblk) 53575d66ffbSDmitry Fomichev return ERR_PTR(-ENOMEM); 5363b1a94c8SDamien Le Moal 5373b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 5383b1a94c8SDamien Le Moal if (!bio) { 5393b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 54075d66ffbSDmitry Fomichev return ERR_PTR(-ENOMEM); 5413b1a94c8SDamien Le Moal } 5423b1a94c8SDamien Le Moal 5433d4e7383SDamien Le Moal spin_lock(&zmd->mblk_lock); 5443d4e7383SDamien Le Moal 5453d4e7383SDamien Le Moal /* 5463d4e7383SDamien Le Moal * Make sure that another context did not start reading 5473d4e7383SDamien Le Moal * the block already. 5483d4e7383SDamien Le Moal */ 5493d4e7383SDamien Le Moal m = dmz_get_mblock_fast(zmd, mblk_no); 5503d4e7383SDamien Le Moal if (m) { 5513d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5523d4e7383SDamien Le Moal dmz_free_mblock(zmd, mblk); 5533d4e7383SDamien Le Moal bio_put(bio); 5543d4e7383SDamien Le Moal return m; 5553d4e7383SDamien Le Moal } 5563d4e7383SDamien Le Moal 5573d4e7383SDamien Le Moal mblk->ref++; 5583d4e7383SDamien Le Moal set_bit(DMZ_META_READING, &mblk->state); 5593d4e7383SDamien Le Moal dmz_insert_mblock(zmd, mblk); 5603d4e7383SDamien Le Moal 5613d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5623d4e7383SDamien Le Moal 5633d4e7383SDamien Le Moal /* Submit read BIO */ 5643b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 565bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 5663b1a94c8SDamien Le Moal bio->bi_private = mblk; 5673b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 5683b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); 5693b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 5703b1a94c8SDamien Le Moal submit_bio(bio); 5713b1a94c8SDamien Le Moal 5723b1a94c8SDamien Le Moal return mblk; 5733b1a94c8SDamien Le Moal } 5743b1a94c8SDamien Le Moal 5753b1a94c8SDamien Le Moal /* 5763b1a94c8SDamien Le Moal * Free metadata blocks. 5773b1a94c8SDamien Le Moal */ 5783b1a94c8SDamien Le Moal static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, 5793b1a94c8SDamien Le Moal unsigned long limit) 5803b1a94c8SDamien Le Moal { 5813b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 5823b1a94c8SDamien Le Moal unsigned long count = 0; 5833b1a94c8SDamien Le Moal 5843b1a94c8SDamien Le Moal if (!zmd->max_nr_mblks) 5853b1a94c8SDamien Le Moal return 0; 5863b1a94c8SDamien Le Moal 5873b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list) && 5883b1a94c8SDamien Le Moal atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && 5893b1a94c8SDamien Le Moal count < limit) { 5903b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 5913b1a94c8SDamien Le Moal struct dmz_mblock, link); 5923b1a94c8SDamien Le Moal list_del_init(&mblk->link); 5933b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 5943b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 5953b1a94c8SDamien Le Moal count++; 5963b1a94c8SDamien Le Moal } 5973b1a94c8SDamien Le Moal 5983b1a94c8SDamien Le Moal return count; 5993b1a94c8SDamien Le Moal } 6003b1a94c8SDamien Le Moal 6013b1a94c8SDamien Le Moal /* 6023b1a94c8SDamien Le Moal * For mblock shrinker: get the number of unused metadata blocks in the cache. 6033b1a94c8SDamien Le Moal */ 6043b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, 6053b1a94c8SDamien Le Moal struct shrink_control *sc) 6063b1a94c8SDamien Le Moal { 6073b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 6083b1a94c8SDamien Le Moal 6093b1a94c8SDamien Le Moal return atomic_read(&zmd->nr_mblks); 6103b1a94c8SDamien Le Moal } 6113b1a94c8SDamien Le Moal 6123b1a94c8SDamien Le Moal /* 6133b1a94c8SDamien Le Moal * For mblock shrinker: scan unused metadata blocks and shrink the cache. 6143b1a94c8SDamien Le Moal */ 6153b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, 6163b1a94c8SDamien Le Moal struct shrink_control *sc) 6173b1a94c8SDamien Le Moal { 6183b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 6193b1a94c8SDamien Le Moal unsigned long count; 6203b1a94c8SDamien Le Moal 6213b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6223b1a94c8SDamien Le Moal count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); 6233b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6243b1a94c8SDamien Le Moal 6253b1a94c8SDamien Le Moal return count ? count : SHRINK_STOP; 6263b1a94c8SDamien Le Moal } 6273b1a94c8SDamien Le Moal 6283b1a94c8SDamien Le Moal /* 6293b1a94c8SDamien Le Moal * Release a metadata block. 6303b1a94c8SDamien Le Moal */ 6313b1a94c8SDamien Le Moal static void dmz_release_mblock(struct dmz_metadata *zmd, 6323b1a94c8SDamien Le Moal struct dmz_mblock *mblk) 6333b1a94c8SDamien Le Moal { 6343b1a94c8SDamien Le Moal 6353b1a94c8SDamien Le Moal if (!mblk) 6363b1a94c8SDamien Le Moal return; 6373b1a94c8SDamien Le Moal 6383b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6393b1a94c8SDamien Le Moal 64033c2865fSDamien Le Moal mblk->ref--; 64133c2865fSDamien Le Moal if (mblk->ref == 0) { 6423b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 6433b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 6443b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 6453b1a94c8SDamien Le Moal } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { 6463b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 6473b1a94c8SDamien Le Moal dmz_shrink_mblock_cache(zmd, 1); 6483b1a94c8SDamien Le Moal } 6493b1a94c8SDamien Le Moal } 6503b1a94c8SDamien Le Moal 6513b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6523b1a94c8SDamien Le Moal } 6533b1a94c8SDamien Le Moal 6543b1a94c8SDamien Le Moal /* 6553b1a94c8SDamien Le Moal * Get a metadata block from the rbtree. If the block 6563b1a94c8SDamien Le Moal * is not present, read it from disk. 6573b1a94c8SDamien Le Moal */ 6583b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, 6593b1a94c8SDamien Le Moal sector_t mblk_no) 6603b1a94c8SDamien Le Moal { 6613b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 662bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; 6633b1a94c8SDamien Le Moal 6643b1a94c8SDamien Le Moal /* Check rbtree */ 6653b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6663d4e7383SDamien Le Moal mblk = dmz_get_mblock_fast(zmd, mblk_no); 6673b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6683b1a94c8SDamien Le Moal 6693b1a94c8SDamien Le Moal if (!mblk) { 6703b1a94c8SDamien Le Moal /* Cache miss: read the block from disk */ 6713d4e7383SDamien Le Moal mblk = dmz_get_mblock_slow(zmd, mblk_no); 67275d66ffbSDmitry Fomichev if (IS_ERR(mblk)) 67375d66ffbSDmitry Fomichev return mblk; 6743b1a94c8SDamien Le Moal } 6753b1a94c8SDamien Le Moal 6763b1a94c8SDamien Le Moal /* Wait for on-going read I/O and check for error */ 6773b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_READING, 6783b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 6793b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 6803b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 681bf28a3baSHannes Reinecke dmz_check_bdev(dev); 6823b1a94c8SDamien Le Moal return ERR_PTR(-EIO); 6833b1a94c8SDamien Le Moal } 6843b1a94c8SDamien Le Moal 6853b1a94c8SDamien Le Moal return mblk; 6863b1a94c8SDamien Le Moal } 6873b1a94c8SDamien Le Moal 6883b1a94c8SDamien Le Moal /* 6893b1a94c8SDamien Le Moal * Mark a metadata block dirty. 6903b1a94c8SDamien Le Moal */ 6913b1a94c8SDamien Le Moal static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 6923b1a94c8SDamien Le Moal { 6933b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6943b1a94c8SDamien Le Moal if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) 6953b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_dirty_list); 6963b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6973b1a94c8SDamien Le Moal } 6983b1a94c8SDamien Le Moal 6993b1a94c8SDamien Le Moal /* 7003b1a94c8SDamien Le Moal * Issue a metadata block write BIO. 7013b1a94c8SDamien Le Moal */ 70275d66ffbSDmitry Fomichev static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, 7033b1a94c8SDamien Le Moal unsigned int set) 7043b1a94c8SDamien Le Moal { 705bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 7063b1a94c8SDamien Le Moal sector_t block = zmd->sb[set].block + mblk->no; 7073b1a94c8SDamien Le Moal struct bio *bio; 7083b1a94c8SDamien Le Moal 709bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 71075d66ffbSDmitry Fomichev return -EIO; 71175d66ffbSDmitry Fomichev 7123b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 7133b1a94c8SDamien Le Moal if (!bio) { 7143b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 71575d66ffbSDmitry Fomichev return -ENOMEM; 7163b1a94c8SDamien Le Moal } 7173b1a94c8SDamien Le Moal 7183b1a94c8SDamien Le Moal set_bit(DMZ_META_WRITING, &mblk->state); 7193b1a94c8SDamien Le Moal 7203b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 721bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 7223b1a94c8SDamien Le Moal bio->bi_private = mblk; 7233b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 7243b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); 7253b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 7263b1a94c8SDamien Le Moal submit_bio(bio); 72775d66ffbSDmitry Fomichev 72875d66ffbSDmitry Fomichev return 0; 7293b1a94c8SDamien Le Moal } 7303b1a94c8SDamien Le Moal 7313b1a94c8SDamien Le Moal /* 7323b1a94c8SDamien Le Moal * Read/write a metadata block. 7333b1a94c8SDamien Le Moal */ 734bf28a3baSHannes Reinecke static int dmz_rdwr_block(struct dmz_dev *dev, int op, 735bf28a3baSHannes Reinecke sector_t block, struct page *page) 7363b1a94c8SDamien Le Moal { 7373b1a94c8SDamien Le Moal struct bio *bio; 7383b1a94c8SDamien Le Moal int ret; 7393b1a94c8SDamien Le Moal 740bd5c4031SHannes Reinecke if (WARN_ON(!dev)) 741bd5c4031SHannes Reinecke return -EIO; 742bd5c4031SHannes Reinecke 743bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 74475d66ffbSDmitry Fomichev return -EIO; 74575d66ffbSDmitry Fomichev 7463b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 7473b1a94c8SDamien Le Moal if (!bio) 7483b1a94c8SDamien Le Moal return -ENOMEM; 7493b1a94c8SDamien Le Moal 7503b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 751bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 7523b1a94c8SDamien Le Moal bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); 7533b1a94c8SDamien Le Moal bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); 7543b1a94c8SDamien Le Moal ret = submit_bio_wait(bio); 7553b1a94c8SDamien Le Moal bio_put(bio); 7563b1a94c8SDamien Le Moal 757e7fad909SDmitry Fomichev if (ret) 758bf28a3baSHannes Reinecke dmz_check_bdev(dev); 7593b1a94c8SDamien Le Moal return ret; 7603b1a94c8SDamien Le Moal } 7613b1a94c8SDamien Le Moal 7623b1a94c8SDamien Le Moal /* 7633b1a94c8SDamien Le Moal * Write super block of the specified metadata set. 7643b1a94c8SDamien Le Moal */ 7653b1a94c8SDamien Le Moal static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) 7663b1a94c8SDamien Le Moal { 7673b1a94c8SDamien Le Moal struct dmz_mblock *mblk = zmd->sb[set].mblk; 7683b1a94c8SDamien Le Moal struct dmz_super *sb = zmd->sb[set].sb; 769bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 770bd5c4031SHannes Reinecke sector_t sb_block; 7713b1a94c8SDamien Le Moal u64 sb_gen = zmd->sb_gen + 1; 7723b1a94c8SDamien Le Moal int ret; 7733b1a94c8SDamien Le Moal 7743b1a94c8SDamien Le Moal sb->magic = cpu_to_le32(DMZ_MAGIC); 775bd5c4031SHannes Reinecke 776bd5c4031SHannes Reinecke sb->version = cpu_to_le32(zmd->sb_version); 777bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 778bd5c4031SHannes Reinecke BUILD_BUG_ON(UUID_SIZE != 16); 779bd5c4031SHannes Reinecke export_uuid(sb->dmz_uuid, &zmd->uuid); 780bd5c4031SHannes Reinecke memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE); 781bd5c4031SHannes Reinecke export_uuid(sb->dev_uuid, &dev->uuid); 782bd5c4031SHannes Reinecke } 7833b1a94c8SDamien Le Moal 7843b1a94c8SDamien Le Moal sb->gen = cpu_to_le64(sb_gen); 7853b1a94c8SDamien Le Moal 786bd5c4031SHannes Reinecke /* 787bd5c4031SHannes Reinecke * The metadata always references the absolute block address, 788bd5c4031SHannes Reinecke * ie relative to the entire block range, not the per-device 789bd5c4031SHannes Reinecke * block address. 790bd5c4031SHannes Reinecke */ 791bd5c4031SHannes Reinecke sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift; 792bd5c4031SHannes Reinecke sb->sb_block = cpu_to_le64(sb_block); 7933b1a94c8SDamien Le Moal sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); 7943b1a94c8SDamien Le Moal sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); 7953b1a94c8SDamien Le Moal sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); 7963b1a94c8SDamien Le Moal 7973b1a94c8SDamien Le Moal sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); 7983b1a94c8SDamien Le Moal sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); 7993b1a94c8SDamien Le Moal 8003b1a94c8SDamien Le Moal sb->crc = 0; 8013b1a94c8SDamien Le Moal sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); 8023b1a94c8SDamien Le Moal 803bd5c4031SHannes Reinecke ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block, 804bd5c4031SHannes Reinecke mblk->page); 8053b1a94c8SDamien Le Moal if (ret == 0) 806bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 8073b1a94c8SDamien Le Moal 8083b1a94c8SDamien Le Moal return ret; 8093b1a94c8SDamien Le Moal } 8103b1a94c8SDamien Le Moal 8113b1a94c8SDamien Le Moal /* 8123b1a94c8SDamien Le Moal * Write dirty metadata blocks to the specified set. 8133b1a94c8SDamien Le Moal */ 8143b1a94c8SDamien Le Moal static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, 8153b1a94c8SDamien Le Moal struct list_head *write_list, 8163b1a94c8SDamien Le Moal unsigned int set) 8173b1a94c8SDamien Le Moal { 8183b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 819bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 8203b1a94c8SDamien Le Moal struct blk_plug plug; 82175d66ffbSDmitry Fomichev int ret = 0, nr_mblks_submitted = 0; 8223b1a94c8SDamien Le Moal 8233b1a94c8SDamien Le Moal /* Issue writes */ 8243b1a94c8SDamien Le Moal blk_start_plug(&plug); 82575d66ffbSDmitry Fomichev list_for_each_entry(mblk, write_list, link) { 82675d66ffbSDmitry Fomichev ret = dmz_write_mblock(zmd, mblk, set); 82775d66ffbSDmitry Fomichev if (ret) 82875d66ffbSDmitry Fomichev break; 82975d66ffbSDmitry Fomichev nr_mblks_submitted++; 83075d66ffbSDmitry Fomichev } 8313b1a94c8SDamien Le Moal blk_finish_plug(&plug); 8323b1a94c8SDamien Le Moal 8333b1a94c8SDamien Le Moal /* Wait for completion */ 8343b1a94c8SDamien Le Moal list_for_each_entry(mblk, write_list, link) { 83575d66ffbSDmitry Fomichev if (!nr_mblks_submitted) 83675d66ffbSDmitry Fomichev break; 8373b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_WRITING, 8383b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 8393b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 8403b1a94c8SDamien Le Moal clear_bit(DMZ_META_ERROR, &mblk->state); 841bf28a3baSHannes Reinecke dmz_check_bdev(dev); 8423b1a94c8SDamien Le Moal ret = -EIO; 8433b1a94c8SDamien Le Moal } 84475d66ffbSDmitry Fomichev nr_mblks_submitted--; 8453b1a94c8SDamien Le Moal } 8463b1a94c8SDamien Le Moal 8473b1a94c8SDamien Le Moal /* Flush drive cache (this will also sync data) */ 8483b1a94c8SDamien Le Moal if (ret == 0) 849bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 8503b1a94c8SDamien Le Moal 8513b1a94c8SDamien Le Moal return ret; 8523b1a94c8SDamien Le Moal } 8533b1a94c8SDamien Le Moal 8543b1a94c8SDamien Le Moal /* 8553b1a94c8SDamien Le Moal * Log dirty metadata blocks. 8563b1a94c8SDamien Le Moal */ 8573b1a94c8SDamien Le Moal static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, 8583b1a94c8SDamien Le Moal struct list_head *write_list) 8593b1a94c8SDamien Le Moal { 8603b1a94c8SDamien Le Moal unsigned int log_set = zmd->mblk_primary ^ 0x1; 8613b1a94c8SDamien Le Moal int ret; 8623b1a94c8SDamien Le Moal 8633b1a94c8SDamien Le Moal /* Write dirty blocks to the log */ 8643b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); 8653b1a94c8SDamien Le Moal if (ret) 8663b1a94c8SDamien Le Moal return ret; 8673b1a94c8SDamien Le Moal 8683b1a94c8SDamien Le Moal /* 8693b1a94c8SDamien Le Moal * No error so far: now validate the log by updating the 8703b1a94c8SDamien Le Moal * log index super block generation. 8713b1a94c8SDamien Le Moal */ 8723b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, log_set); 8733b1a94c8SDamien Le Moal if (ret) 8743b1a94c8SDamien Le Moal return ret; 8753b1a94c8SDamien Le Moal 8763b1a94c8SDamien Le Moal return 0; 8773b1a94c8SDamien Le Moal } 8783b1a94c8SDamien Le Moal 8793b1a94c8SDamien Le Moal /* 8803b1a94c8SDamien Le Moal * Flush dirty metadata blocks. 8813b1a94c8SDamien Le Moal */ 8823b1a94c8SDamien Le Moal int dmz_flush_metadata(struct dmz_metadata *zmd) 8833b1a94c8SDamien Le Moal { 8843b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 8853b1a94c8SDamien Le Moal struct list_head write_list; 886bf28a3baSHannes Reinecke struct dmz_dev *dev; 8873b1a94c8SDamien Le Moal int ret; 8883b1a94c8SDamien Le Moal 8893b1a94c8SDamien Le Moal if (WARN_ON(!zmd)) 8903b1a94c8SDamien Le Moal return 0; 8913b1a94c8SDamien Le Moal 8923b1a94c8SDamien Le Moal INIT_LIST_HEAD(&write_list); 8933b1a94c8SDamien Le Moal 8943b1a94c8SDamien Le Moal /* 8953b1a94c8SDamien Le Moal * Make sure that metadata blocks are stable before logging: take 8963b1a94c8SDamien Le Moal * the write lock on the metadata semaphore to prevent target BIOs 8973b1a94c8SDamien Le Moal * from modifying metadata. 8983b1a94c8SDamien Le Moal */ 8993b1a94c8SDamien Le Moal down_write(&zmd->mblk_sem); 900bf28a3baSHannes Reinecke dev = zmd->sb[zmd->mblk_primary].dev; 9013b1a94c8SDamien Le Moal 9023b1a94c8SDamien Le Moal /* 9033b1a94c8SDamien Le Moal * This is called from the target flush work and reclaim work. 9043b1a94c8SDamien Le Moal * Concurrent execution is not allowed. 9053b1a94c8SDamien Le Moal */ 9063b1a94c8SDamien Le Moal dmz_lock_flush(zmd); 9073b1a94c8SDamien Le Moal 908bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) { 90975d66ffbSDmitry Fomichev ret = -EIO; 91075d66ffbSDmitry Fomichev goto out; 91175d66ffbSDmitry Fomichev } 91275d66ffbSDmitry Fomichev 9133b1a94c8SDamien Le Moal /* Get dirty blocks */ 9143b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 9153b1a94c8SDamien Le Moal list_splice_init(&zmd->mblk_dirty_list, &write_list); 9163b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 9173b1a94c8SDamien Le Moal 9183b1a94c8SDamien Le Moal /* If there are no dirty metadata blocks, just flush the device cache */ 9193b1a94c8SDamien Le Moal if (list_empty(&write_list)) { 920bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 921e7fad909SDmitry Fomichev goto err; 9223b1a94c8SDamien Le Moal } 9233b1a94c8SDamien Le Moal 9243b1a94c8SDamien Le Moal /* 9253b1a94c8SDamien Le Moal * The primary metadata set is still clean. Keep it this way until 9263b1a94c8SDamien Le Moal * all updates are successful in the secondary set. That is, use 9273b1a94c8SDamien Le Moal * the secondary set as a log. 9283b1a94c8SDamien Le Moal */ 9293b1a94c8SDamien Le Moal ret = dmz_log_dirty_mblocks(zmd, &write_list); 9303b1a94c8SDamien Le Moal if (ret) 931e7fad909SDmitry Fomichev goto err; 9323b1a94c8SDamien Le Moal 9333b1a94c8SDamien Le Moal /* 9343b1a94c8SDamien Le Moal * The log is on disk. It is now safe to update in place 9353b1a94c8SDamien Le Moal * in the primary metadata set. 9363b1a94c8SDamien Le Moal */ 9373b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); 9383b1a94c8SDamien Le Moal if (ret) 939e7fad909SDmitry Fomichev goto err; 9403b1a94c8SDamien Le Moal 9413b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, zmd->mblk_primary); 9423b1a94c8SDamien Le Moal if (ret) 943e7fad909SDmitry Fomichev goto err; 9443b1a94c8SDamien Le Moal 9453b1a94c8SDamien Le Moal while (!list_empty(&write_list)) { 9463b1a94c8SDamien Le Moal mblk = list_first_entry(&write_list, struct dmz_mblock, link); 9473b1a94c8SDamien Le Moal list_del_init(&mblk->link); 9483b1a94c8SDamien Le Moal 9493b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 9503b1a94c8SDamien Le Moal clear_bit(DMZ_META_DIRTY, &mblk->state); 95133c2865fSDamien Le Moal if (mblk->ref == 0) 9523b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 9533b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 9543b1a94c8SDamien Le Moal } 9553b1a94c8SDamien Le Moal 9563b1a94c8SDamien Le Moal zmd->sb_gen++; 9573b1a94c8SDamien Le Moal out: 9583b1a94c8SDamien Le Moal dmz_unlock_flush(zmd); 9593b1a94c8SDamien Le Moal up_write(&zmd->mblk_sem); 9603b1a94c8SDamien Le Moal 9613b1a94c8SDamien Le Moal return ret; 962e7fad909SDmitry Fomichev 963e7fad909SDmitry Fomichev err: 964e7fad909SDmitry Fomichev if (!list_empty(&write_list)) { 965e7fad909SDmitry Fomichev spin_lock(&zmd->mblk_lock); 966e7fad909SDmitry Fomichev list_splice(&write_list, &zmd->mblk_dirty_list); 967e7fad909SDmitry Fomichev spin_unlock(&zmd->mblk_lock); 968e7fad909SDmitry Fomichev } 969bf28a3baSHannes Reinecke if (!dmz_check_bdev(dev)) 970e7fad909SDmitry Fomichev ret = -EIO; 971e7fad909SDmitry Fomichev goto out; 9723b1a94c8SDamien Le Moal } 9733b1a94c8SDamien Le Moal 9743b1a94c8SDamien Le Moal /* 9753b1a94c8SDamien Le Moal * Check super block. 9763b1a94c8SDamien Le Moal */ 977735bd7e4SHannes Reinecke static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set) 9783b1a94c8SDamien Le Moal { 979735bd7e4SHannes Reinecke struct dmz_super *sb = zmd->sb[set].sb; 980bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 9813b1a94c8SDamien Le Moal unsigned int nr_meta_zones, nr_data_zones; 9823b1a94c8SDamien Le Moal u32 crc, stored_crc; 9833b1a94c8SDamien Le Moal u64 gen; 9843b1a94c8SDamien Le Moal 985bd5c4031SHannes Reinecke if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { 986bd5c4031SHannes Reinecke dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", 987bd5c4031SHannes Reinecke DMZ_MAGIC, le32_to_cpu(sb->magic)); 988bd5c4031SHannes Reinecke return -ENXIO; 989bd5c4031SHannes Reinecke } 990bd5c4031SHannes Reinecke 991bd5c4031SHannes Reinecke zmd->sb_version = le32_to_cpu(sb->version); 992bd5c4031SHannes Reinecke if (zmd->sb_version > DMZ_META_VER) { 993bd5c4031SHannes Reinecke dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", 994bd5c4031SHannes Reinecke DMZ_META_VER, zmd->sb_version); 995bd5c4031SHannes Reinecke return -EINVAL; 996bd5c4031SHannes Reinecke } 997bd5c4031SHannes Reinecke if ((zmd->sb_version < 1) && (set == 2)) { 998bd5c4031SHannes Reinecke dmz_dev_err(dev, "Tertiary superblocks are not supported"); 999bd5c4031SHannes Reinecke return -EINVAL; 1000bd5c4031SHannes Reinecke } 1001bd5c4031SHannes Reinecke 10023b1a94c8SDamien Le Moal gen = le64_to_cpu(sb->gen); 10033b1a94c8SDamien Le Moal stored_crc = le32_to_cpu(sb->crc); 10043b1a94c8SDamien Le Moal sb->crc = 0; 10053b1a94c8SDamien Le Moal crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); 10063b1a94c8SDamien Le Moal if (crc != stored_crc) { 10073b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", 10083b1a94c8SDamien Le Moal crc, stored_crc); 10093b1a94c8SDamien Le Moal return -ENXIO; 10103b1a94c8SDamien Le Moal } 10113b1a94c8SDamien Le Moal 1012bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 1013bd5c4031SHannes Reinecke uuid_t sb_uuid; 1014bd5c4031SHannes Reinecke 1015bd5c4031SHannes Reinecke import_uuid(&sb_uuid, sb->dmz_uuid); 1016bd5c4031SHannes Reinecke if (uuid_is_null(&sb_uuid)) { 1017bd5c4031SHannes Reinecke dmz_dev_err(dev, "NULL DM-Zoned uuid"); 1018bd5c4031SHannes Reinecke return -ENXIO; 1019bd5c4031SHannes Reinecke } else if (uuid_is_null(&zmd->uuid)) { 1020bd5c4031SHannes Reinecke uuid_copy(&zmd->uuid, &sb_uuid); 1021bd5c4031SHannes Reinecke } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) { 1022bd5c4031SHannes Reinecke dmz_dev_err(dev, "mismatching DM-Zoned uuid, " 1023bd5c4031SHannes Reinecke "is %pUl expected %pUl", 1024bd5c4031SHannes Reinecke &sb_uuid, &zmd->uuid); 1025bd5c4031SHannes Reinecke return -ENXIO; 1026bd5c4031SHannes Reinecke } 1027bd5c4031SHannes Reinecke if (!strlen(zmd->label)) 1028bd5c4031SHannes Reinecke memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE); 1029bd5c4031SHannes Reinecke else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) { 1030bd5c4031SHannes Reinecke dmz_dev_err(dev, "mismatching DM-Zoned label, " 1031bd5c4031SHannes Reinecke "is %s expected %s", 1032bd5c4031SHannes Reinecke sb->dmz_label, zmd->label); 1033bd5c4031SHannes Reinecke return -ENXIO; 1034bd5c4031SHannes Reinecke } 1035bd5c4031SHannes Reinecke import_uuid(&dev->uuid, sb->dev_uuid); 1036bd5c4031SHannes Reinecke if (uuid_is_null(&dev->uuid)) { 1037bd5c4031SHannes Reinecke dmz_dev_err(dev, "NULL device uuid"); 10383b1a94c8SDamien Le Moal return -ENXIO; 10393b1a94c8SDamien Le Moal } 10403b1a94c8SDamien Le Moal 1041bd5c4031SHannes Reinecke if (set == 2) { 1042bd5c4031SHannes Reinecke /* 1043bd5c4031SHannes Reinecke * Generation number should be 0, but it doesn't 1044bd5c4031SHannes Reinecke * really matter if it isn't. 1045bd5c4031SHannes Reinecke */ 1046bd5c4031SHannes Reinecke if (gen != 0) 1047bd5c4031SHannes Reinecke dmz_dev_warn(dev, "Invalid generation %llu", 1048bd5c4031SHannes Reinecke gen); 1049bd5c4031SHannes Reinecke return 0; 1050bd5c4031SHannes Reinecke } 10513b1a94c8SDamien Le Moal } 10523b1a94c8SDamien Le Moal 105336820560SHannes Reinecke nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1) 105436820560SHannes Reinecke >> zmd->zone_nr_blocks_shift; 10553b1a94c8SDamien Le Moal if (!nr_meta_zones || 10563b1a94c8SDamien Le Moal nr_meta_zones >= zmd->nr_rnd_zones) { 10573b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of metadata blocks"); 10583b1a94c8SDamien Le Moal return -ENXIO; 10593b1a94c8SDamien Le Moal } 10603b1a94c8SDamien Le Moal 10613b1a94c8SDamien Le Moal if (!le32_to_cpu(sb->nr_reserved_seq) || 10623b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { 10633b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of reserved sequential zones"); 10643b1a94c8SDamien Le Moal return -ENXIO; 10653b1a94c8SDamien Le Moal } 10663b1a94c8SDamien Le Moal 10673b1a94c8SDamien Le Moal nr_data_zones = zmd->nr_useable_zones - 10683b1a94c8SDamien Le Moal (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); 10693b1a94c8SDamien Le Moal if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { 10703b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of chunks %u / %u", 10713b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_chunks), nr_data_zones); 10723b1a94c8SDamien Le Moal return -ENXIO; 10733b1a94c8SDamien Le Moal } 10743b1a94c8SDamien Le Moal 10753b1a94c8SDamien Le Moal /* OK */ 10763b1a94c8SDamien Le Moal zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); 10773b1a94c8SDamien Le Moal zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); 10783b1a94c8SDamien Le Moal zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); 10793b1a94c8SDamien Le Moal zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); 10803b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); 10813b1a94c8SDamien Le Moal zmd->nr_meta_zones = nr_meta_zones; 10823b1a94c8SDamien Le Moal zmd->nr_data_zones = nr_data_zones; 10833b1a94c8SDamien Le Moal 10843b1a94c8SDamien Le Moal return 0; 10853b1a94c8SDamien Le Moal } 10863b1a94c8SDamien Le Moal 10873b1a94c8SDamien Le Moal /* 10883b1a94c8SDamien Le Moal * Read the first or second super block from disk. 10893b1a94c8SDamien Le Moal */ 10903b1a94c8SDamien Le Moal static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) 10913b1a94c8SDamien Le Moal { 1092bf28a3baSHannes Reinecke return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ, 1093bf28a3baSHannes Reinecke zmd->sb[set].block, zmd->sb[set].mblk->page); 10943b1a94c8SDamien Le Moal } 10953b1a94c8SDamien Le Moal 10963b1a94c8SDamien Le Moal /* 10973b1a94c8SDamien Le Moal * Determine the position of the secondary super blocks on disk. 10983b1a94c8SDamien Le Moal * This is used only if a corruption of the primary super block 10993b1a94c8SDamien Le Moal * is detected. 11003b1a94c8SDamien Le Moal */ 11013b1a94c8SDamien Le Moal static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) 11023b1a94c8SDamien Le Moal { 110336820560SHannes Reinecke unsigned int zone_nr_blocks = zmd->zone_nr_blocks; 11043b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 11053b1a94c8SDamien Le Moal int i; 11063b1a94c8SDamien Le Moal 11073b1a94c8SDamien Le Moal /* Allocate a block */ 11083b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 11093b1a94c8SDamien Le Moal if (!mblk) 11103b1a94c8SDamien Le Moal return -ENOMEM; 11113b1a94c8SDamien Le Moal 11123b1a94c8SDamien Le Moal zmd->sb[1].mblk = mblk; 11133b1a94c8SDamien Le Moal zmd->sb[1].sb = mblk->data; 11143b1a94c8SDamien Le Moal 11153b1a94c8SDamien Le Moal /* Bad first super block: search for the second one */ 11163b1a94c8SDamien Le Moal zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; 1117735bd7e4SHannes Reinecke zmd->sb[1].zone = zmd->sb[0].zone + 1; 1118bf28a3baSHannes Reinecke zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone); 11193b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_rnd_zones - 1; i++) { 11203b1a94c8SDamien Le Moal if (dmz_read_sb(zmd, 1) != 0) 11213b1a94c8SDamien Le Moal break; 1122735bd7e4SHannes Reinecke if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) { 1123735bd7e4SHannes Reinecke zmd->sb[1].zone += i; 11243b1a94c8SDamien Le Moal return 0; 1125735bd7e4SHannes Reinecke } 11263b1a94c8SDamien Le Moal zmd->sb[1].block += zone_nr_blocks; 1127bf28a3baSHannes Reinecke zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone + i); 11283b1a94c8SDamien Le Moal } 11293b1a94c8SDamien Le Moal 11303b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 11313b1a94c8SDamien Le Moal zmd->sb[1].mblk = NULL; 1132735bd7e4SHannes Reinecke zmd->sb[1].zone = NULL; 1133bf28a3baSHannes Reinecke zmd->sb[1].dev = NULL; 11343b1a94c8SDamien Le Moal 11353b1a94c8SDamien Le Moal return -EIO; 11363b1a94c8SDamien Le Moal } 11373b1a94c8SDamien Le Moal 11383b1a94c8SDamien Le Moal /* 11393b1a94c8SDamien Le Moal * Read the first or second super block from disk. 11403b1a94c8SDamien Le Moal */ 11413b1a94c8SDamien Le Moal static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) 11423b1a94c8SDamien Le Moal { 11433b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 11443b1a94c8SDamien Le Moal int ret; 11453b1a94c8SDamien Le Moal 11463b1a94c8SDamien Le Moal /* Allocate a block */ 11473b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 11483b1a94c8SDamien Le Moal if (!mblk) 11493b1a94c8SDamien Le Moal return -ENOMEM; 11503b1a94c8SDamien Le Moal 11513b1a94c8SDamien Le Moal zmd->sb[set].mblk = mblk; 11523b1a94c8SDamien Le Moal zmd->sb[set].sb = mblk->data; 11533b1a94c8SDamien Le Moal 11543b1a94c8SDamien Le Moal /* Read super block */ 11553b1a94c8SDamien Le Moal ret = dmz_read_sb(zmd, set); 11563b1a94c8SDamien Le Moal if (ret) { 11573b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 11583b1a94c8SDamien Le Moal zmd->sb[set].mblk = NULL; 11593b1a94c8SDamien Le Moal return ret; 11603b1a94c8SDamien Le Moal } 11613b1a94c8SDamien Le Moal 11623b1a94c8SDamien Le Moal return 0; 11633b1a94c8SDamien Le Moal } 11643b1a94c8SDamien Le Moal 11653b1a94c8SDamien Le Moal /* 11663b1a94c8SDamien Le Moal * Recover a metadata set. 11673b1a94c8SDamien Le Moal */ 11683b1a94c8SDamien Le Moal static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) 11693b1a94c8SDamien Le Moal { 11703b1a94c8SDamien Le Moal unsigned int src_set = dst_set ^ 0x1; 11713b1a94c8SDamien Le Moal struct page *page; 11723b1a94c8SDamien Le Moal int i, ret; 11733b1a94c8SDamien Le Moal 1174bf28a3baSHannes Reinecke dmz_dev_warn(zmd->sb[dst_set].dev, 1175bf28a3baSHannes Reinecke "Metadata set %u invalid: recovering", dst_set); 11763b1a94c8SDamien Le Moal 11773b1a94c8SDamien Le Moal if (dst_set == 0) 1178735bd7e4SHannes Reinecke zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); 1179735bd7e4SHannes Reinecke else 1180735bd7e4SHannes Reinecke zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); 11813b1a94c8SDamien Le Moal 11824218a955SDamien Le Moal page = alloc_page(GFP_NOIO); 11833b1a94c8SDamien Le Moal if (!page) 11843b1a94c8SDamien Le Moal return -ENOMEM; 11853b1a94c8SDamien Le Moal 11863b1a94c8SDamien Le Moal /* Copy metadata blocks */ 11873b1a94c8SDamien Le Moal for (i = 1; i < zmd->nr_meta_blocks; i++) { 1188bf28a3baSHannes Reinecke ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ, 11893b1a94c8SDamien Le Moal zmd->sb[src_set].block + i, page); 11903b1a94c8SDamien Le Moal if (ret) 11913b1a94c8SDamien Le Moal goto out; 1192bf28a3baSHannes Reinecke ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE, 11933b1a94c8SDamien Le Moal zmd->sb[dst_set].block + i, page); 11943b1a94c8SDamien Le Moal if (ret) 11953b1a94c8SDamien Le Moal goto out; 11963b1a94c8SDamien Le Moal } 11973b1a94c8SDamien Le Moal 11983b1a94c8SDamien Le Moal /* Finalize with the super block */ 11993b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 12003b1a94c8SDamien Le Moal zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); 12013b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 12023b1a94c8SDamien Le Moal ret = -ENOMEM; 12033b1a94c8SDamien Le Moal goto out; 12043b1a94c8SDamien Le Moal } 12053b1a94c8SDamien Le Moal zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; 12063b1a94c8SDamien Le Moal } 12073b1a94c8SDamien Le Moal 12083b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, dst_set); 12093b1a94c8SDamien Le Moal out: 12103b1a94c8SDamien Le Moal __free_pages(page, 0); 12113b1a94c8SDamien Le Moal 12123b1a94c8SDamien Le Moal return ret; 12133b1a94c8SDamien Le Moal } 12143b1a94c8SDamien Le Moal 12153b1a94c8SDamien Le Moal /* 12163b1a94c8SDamien Le Moal * Get super block from disk. 12173b1a94c8SDamien Le Moal */ 12183b1a94c8SDamien Le Moal static int dmz_load_sb(struct dmz_metadata *zmd) 12193b1a94c8SDamien Le Moal { 12203b1a94c8SDamien Le Moal bool sb_good[2] = {false, false}; 12213b1a94c8SDamien Le Moal u64 sb_gen[2] = {0, 0}; 12223b1a94c8SDamien Le Moal int ret; 12233b1a94c8SDamien Le Moal 1224735bd7e4SHannes Reinecke if (!zmd->sb[0].zone) { 1225ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Primary super block zone not set"); 1226735bd7e4SHannes Reinecke return -ENXIO; 1227735bd7e4SHannes Reinecke } 1228735bd7e4SHannes Reinecke 12293b1a94c8SDamien Le Moal /* Read and check the primary super block */ 1230735bd7e4SHannes Reinecke zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); 1231bf28a3baSHannes Reinecke zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone); 12323b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 0); 12333b1a94c8SDamien Le Moal if (ret) { 1234bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed"); 12353b1a94c8SDamien Le Moal return ret; 12363b1a94c8SDamien Le Moal } 12373b1a94c8SDamien Le Moal 1238735bd7e4SHannes Reinecke ret = dmz_check_sb(zmd, 0); 12393b1a94c8SDamien Le Moal 12403b1a94c8SDamien Le Moal /* Read and check secondary super block */ 12413b1a94c8SDamien Le Moal if (ret == 0) { 12423b1a94c8SDamien Le Moal sb_good[0] = true; 1243735bd7e4SHannes Reinecke if (!zmd->sb[1].zone) 1244735bd7e4SHannes Reinecke zmd->sb[1].zone = zmd->sb[0].zone + zmd->nr_meta_zones; 1245735bd7e4SHannes Reinecke zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); 1246bf28a3baSHannes Reinecke zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone); 12473b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 1); 12483b1a94c8SDamien Le Moal } else 12493b1a94c8SDamien Le Moal ret = dmz_lookup_secondary_sb(zmd); 12503b1a94c8SDamien Le Moal 12513b1a94c8SDamien Le Moal if (ret) { 1252bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed"); 12533b1a94c8SDamien Le Moal return ret; 12543b1a94c8SDamien Le Moal } 12553b1a94c8SDamien Le Moal 1256735bd7e4SHannes Reinecke ret = dmz_check_sb(zmd, 1); 12573b1a94c8SDamien Le Moal if (ret == 0) 12583b1a94c8SDamien Le Moal sb_good[1] = true; 12593b1a94c8SDamien Le Moal 12603b1a94c8SDamien Le Moal /* Use highest generation sb first */ 12613b1a94c8SDamien Le Moal if (!sb_good[0] && !sb_good[1]) { 1262ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "No valid super block found"); 12633b1a94c8SDamien Le Moal return -EIO; 12643b1a94c8SDamien Le Moal } 12653b1a94c8SDamien Le Moal 12663b1a94c8SDamien Le Moal if (sb_good[0]) 12673b1a94c8SDamien Le Moal sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); 1268bf28a3baSHannes Reinecke else { 12693b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 0); 1270bf28a3baSHannes Reinecke if (ret) { 1271bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[0].dev, 1272bf28a3baSHannes Reinecke "Recovery of superblock 0 failed"); 1273bf28a3baSHannes Reinecke return -EIO; 1274bf28a3baSHannes Reinecke } 1275bf28a3baSHannes Reinecke } 12763b1a94c8SDamien Le Moal 12773b1a94c8SDamien Le Moal if (sb_good[1]) 12783b1a94c8SDamien Le Moal sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); 1279bf28a3baSHannes Reinecke else { 12803b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 1); 12813b1a94c8SDamien Le Moal 12823b1a94c8SDamien Le Moal if (ret) { 1283bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[1].dev, 1284bf28a3baSHannes Reinecke "Recovery of superblock 1 failed"); 12853b1a94c8SDamien Le Moal return -EIO; 12863b1a94c8SDamien Le Moal } 1287bf28a3baSHannes Reinecke } 12883b1a94c8SDamien Le Moal 12893b1a94c8SDamien Le Moal if (sb_gen[0] >= sb_gen[1]) { 12903b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[0]; 12913b1a94c8SDamien Le Moal zmd->mblk_primary = 0; 12923b1a94c8SDamien Le Moal } else { 12933b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[1]; 12943b1a94c8SDamien Le Moal zmd->mblk_primary = 1; 12953b1a94c8SDamien Le Moal } 12963b1a94c8SDamien Le Moal 1297bf28a3baSHannes Reinecke dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev, 1298bf28a3baSHannes Reinecke "Using super block %u (gen %llu)", 12993b1a94c8SDamien Le Moal zmd->mblk_primary, zmd->sb_gen); 13003b1a94c8SDamien Le Moal 1301bd5c4031SHannes Reinecke if ((zmd->sb_version > 1) && zmd->sb[2].zone) { 1302bd5c4031SHannes Reinecke zmd->sb[2].block = dmz_start_block(zmd, zmd->sb[2].zone); 1303bd5c4031SHannes Reinecke zmd->sb[2].dev = dmz_zone_to_dev(zmd, zmd->sb[2].zone); 1304bd5c4031SHannes Reinecke ret = dmz_get_sb(zmd, 2); 1305bd5c4031SHannes Reinecke if (ret) { 1306bd5c4031SHannes Reinecke dmz_dev_err(zmd->sb[2].dev, 1307bd5c4031SHannes Reinecke "Read tertiary super block failed"); 1308bd5c4031SHannes Reinecke return ret; 1309bd5c4031SHannes Reinecke } 1310bd5c4031SHannes Reinecke ret = dmz_check_sb(zmd, 2); 1311bd5c4031SHannes Reinecke if (ret == -EINVAL) 1312bd5c4031SHannes Reinecke return ret; 1313bd5c4031SHannes Reinecke } 13143b1a94c8SDamien Le Moal return 0; 13153b1a94c8SDamien Le Moal } 13163b1a94c8SDamien Le Moal 13173b1a94c8SDamien Le Moal /* 13183b1a94c8SDamien Le Moal * Initialize a zone descriptor. 13193b1a94c8SDamien Le Moal */ 1320bd5c4031SHannes Reinecke static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data) 13213b1a94c8SDamien Le Moal { 1322d4100351SChristoph Hellwig struct dmz_metadata *zmd = data; 1323bd5c4031SHannes Reinecke struct dmz_dev *dev = zmd->nr_devs > 1 ? &zmd->dev[1] : &zmd->dev[0]; 1324bd5c4031SHannes Reinecke int idx = num + dev->zone_offset; 1325d4100351SChristoph Hellwig struct dm_zone *zone = &zmd->zones[idx]; 13263b1a94c8SDamien Le Moal 132736820560SHannes Reinecke if (blkz->len != zmd->zone_nr_sectors) { 1328bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 1329bd5c4031SHannes Reinecke /* Ignore the eventual runt (smaller) zone */ 1330bd5c4031SHannes Reinecke set_bit(DMZ_OFFLINE, &zone->flags); 1331bd5c4031SHannes Reinecke return 0; 1332bd5c4031SHannes Reinecke } else if (blkz->start + blkz->len == dev->capacity) 13333b1a94c8SDamien Le Moal return 0; 13343b1a94c8SDamien Le Moal return -ENXIO; 13353b1a94c8SDamien Le Moal } 13363b1a94c8SDamien Le Moal 13373b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zone->link); 13383b1a94c8SDamien Le Moal atomic_set(&zone->refcount, 0); 1339b7122873SHannes Reinecke zone->id = idx; 13403b1a94c8SDamien Le Moal zone->chunk = DMZ_MAP_UNMAPPED; 13413b1a94c8SDamien Le Moal 1342d4100351SChristoph Hellwig switch (blkz->type) { 1343d4100351SChristoph Hellwig case BLK_ZONE_TYPE_CONVENTIONAL: 13443b1a94c8SDamien Le Moal set_bit(DMZ_RND, &zone->flags); 1345d4100351SChristoph Hellwig break; 1346d4100351SChristoph Hellwig case BLK_ZONE_TYPE_SEQWRITE_REQ: 1347d4100351SChristoph Hellwig case BLK_ZONE_TYPE_SEQWRITE_PREF: 13483b1a94c8SDamien Le Moal set_bit(DMZ_SEQ, &zone->flags); 1349d4100351SChristoph Hellwig break; 1350d4100351SChristoph Hellwig default: 13513b1a94c8SDamien Le Moal return -ENXIO; 1352d4100351SChristoph Hellwig } 13533b1a94c8SDamien Le Moal 13543b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) 13553b1a94c8SDamien Le Moal zone->wp_block = 0; 13563b1a94c8SDamien Le Moal else 13573b1a94c8SDamien Le Moal zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); 13583b1a94c8SDamien Le Moal 1359d4100351SChristoph Hellwig if (blkz->cond == BLK_ZONE_COND_OFFLINE) 1360d4100351SChristoph Hellwig set_bit(DMZ_OFFLINE, &zone->flags); 1361d4100351SChristoph Hellwig else if (blkz->cond == BLK_ZONE_COND_READONLY) 1362d4100351SChristoph Hellwig set_bit(DMZ_READ_ONLY, &zone->flags); 1363d4100351SChristoph Hellwig else { 13643b1a94c8SDamien Le Moal zmd->nr_useable_zones++; 13653b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) { 13663b1a94c8SDamien Le Moal zmd->nr_rnd_zones++; 1367bd5c4031SHannes Reinecke if (zmd->nr_devs == 1 && !zmd->sb[0].zone) { 1368bd5c4031SHannes Reinecke /* Primary super block zone */ 1369735bd7e4SHannes Reinecke zmd->sb[0].zone = zone; 13703b1a94c8SDamien Le Moal } 13713b1a94c8SDamien Le Moal } 1372bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && !zmd->sb[2].zone) { 1373bd5c4031SHannes Reinecke /* Tertiary superblock zone */ 1374bd5c4031SHannes Reinecke zmd->sb[2].zone = zone; 1375bd5c4031SHannes Reinecke } 13763b1a94c8SDamien Le Moal } 13773b1a94c8SDamien Le Moal 13783b1a94c8SDamien Le Moal return 0; 13793b1a94c8SDamien Le Moal } 13803b1a94c8SDamien Le Moal 1381bd5c4031SHannes Reinecke static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev) 1382bd5c4031SHannes Reinecke { 1383bd5c4031SHannes Reinecke int idx; 1384bd5c4031SHannes Reinecke sector_t zone_offset = 0; 1385bd5c4031SHannes Reinecke 1386bd5c4031SHannes Reinecke for(idx = 0; idx < dev->nr_zones; idx++) { 1387bd5c4031SHannes Reinecke struct dm_zone *zone = &zmd->zones[idx]; 1388bd5c4031SHannes Reinecke 1389bd5c4031SHannes Reinecke INIT_LIST_HEAD(&zone->link); 1390bd5c4031SHannes Reinecke atomic_set(&zone->refcount, 0); 1391bd5c4031SHannes Reinecke zone->id = idx; 1392bd5c4031SHannes Reinecke zone->chunk = DMZ_MAP_UNMAPPED; 1393bd5c4031SHannes Reinecke set_bit(DMZ_RND, &zone->flags); 1394bd5c4031SHannes Reinecke zone->wp_block = 0; 1395bd5c4031SHannes Reinecke zmd->nr_rnd_zones++; 1396bd5c4031SHannes Reinecke zmd->nr_useable_zones++; 1397bd5c4031SHannes Reinecke if (dev->capacity - zone_offset < zmd->zone_nr_sectors) { 1398bd5c4031SHannes Reinecke /* Disable runt zone */ 1399bd5c4031SHannes Reinecke set_bit(DMZ_OFFLINE, &zone->flags); 1400bd5c4031SHannes Reinecke break; 1401bd5c4031SHannes Reinecke } 1402bd5c4031SHannes Reinecke zone_offset += zmd->zone_nr_sectors; 1403bd5c4031SHannes Reinecke } 1404bd5c4031SHannes Reinecke } 1405bd5c4031SHannes Reinecke 14063b1a94c8SDamien Le Moal /* 14073b1a94c8SDamien Le Moal * Free zones descriptors. 14083b1a94c8SDamien Le Moal */ 14093b1a94c8SDamien Le Moal static void dmz_drop_zones(struct dmz_metadata *zmd) 14103b1a94c8SDamien Le Moal { 14113b1a94c8SDamien Le Moal kfree(zmd->zones); 14123b1a94c8SDamien Le Moal zmd->zones = NULL; 14133b1a94c8SDamien Le Moal } 14143b1a94c8SDamien Le Moal 14153b1a94c8SDamien Le Moal /* 14163b1a94c8SDamien Le Moal * Allocate and initialize zone descriptors using the zone 14173b1a94c8SDamien Le Moal * information from disk. 14183b1a94c8SDamien Le Moal */ 14193b1a94c8SDamien Le Moal static int dmz_init_zones(struct dmz_metadata *zmd) 14203b1a94c8SDamien Le Moal { 1421bd5c4031SHannes Reinecke int i, ret; 1422bd5c4031SHannes Reinecke struct dmz_dev *zoned_dev = &zmd->dev[0]; 14233b1a94c8SDamien Le Moal 14243b1a94c8SDamien Le Moal /* Init */ 1425bd5c4031SHannes Reinecke zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors; 142636820560SHannes Reinecke zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors); 142736820560SHannes Reinecke zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors); 142836820560SHannes Reinecke zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks); 142936820560SHannes Reinecke zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3; 1430b3996295SDmitry Fomichev zmd->zone_nr_bitmap_blocks = 1431b3996295SDmitry Fomichev max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); 143236820560SHannes Reinecke zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks, 1433b3996295SDmitry Fomichev DMZ_BLOCK_SIZE_BITS); 14343b1a94c8SDamien Le Moal 14353b1a94c8SDamien Le Moal /* Allocate zone array */ 1436bd5c4031SHannes Reinecke zmd->nr_zones = 0; 1437bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) 1438bd5c4031SHannes Reinecke zmd->nr_zones += zmd->dev[i].nr_zones; 1439bd5c4031SHannes Reinecke 1440bd5c4031SHannes Reinecke if (!zmd->nr_zones) { 1441bd5c4031SHannes Reinecke DMERR("(%s): No zones found", zmd->devname); 1442bd5c4031SHannes Reinecke return -ENXIO; 1443bd5c4031SHannes Reinecke } 144436820560SHannes Reinecke zmd->zones = kcalloc(zmd->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); 14453b1a94c8SDamien Le Moal if (!zmd->zones) 14463b1a94c8SDamien Le Moal return -ENOMEM; 14473b1a94c8SDamien Le Moal 1448ae3c1f11SHannes Reinecke DMDEBUG("(%s): Using %zu B for zone information", 1449ca1a7045SHannes Reinecke zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones); 14503b1a94c8SDamien Le Moal 1451bd5c4031SHannes Reinecke if (zmd->nr_devs > 1) { 1452bd5c4031SHannes Reinecke dmz_emulate_zones(zmd, &zmd->dev[0]); 1453bd5c4031SHannes Reinecke /* 1454bd5c4031SHannes Reinecke * Primary superblock zone is always at zone 0 when multiple 1455bd5c4031SHannes Reinecke * drives are present. 1456bd5c4031SHannes Reinecke */ 1457bd5c4031SHannes Reinecke zmd->sb[0].zone = &zmd->zones[0]; 1458bd5c4031SHannes Reinecke 1459bd5c4031SHannes Reinecke zoned_dev = &zmd->dev[1]; 1460bd5c4031SHannes Reinecke } 1461bd5c4031SHannes Reinecke 14623b1a94c8SDamien Le Moal /* 1463d4100351SChristoph Hellwig * Get zone information and initialize zone descriptors. At the same 1464d4100351SChristoph Hellwig * time, determine where the super block should be: first block of the 1465d4100351SChristoph Hellwig * first randomly writable zone. 14663b1a94c8SDamien Le Moal */ 1467bd5c4031SHannes Reinecke ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES, 1468bd5c4031SHannes Reinecke dmz_init_zone, zmd); 1469d4100351SChristoph Hellwig if (ret < 0) { 1470bd5c4031SHannes Reinecke DMDEBUG("(%s): Failed to report zones, error %d", 1471bd5c4031SHannes Reinecke zmd->devname, ret); 14723b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 14733b1a94c8SDamien Le Moal return ret; 14743b1a94c8SDamien Le Moal } 14753b1a94c8SDamien Le Moal 1476d4100351SChristoph Hellwig return 0; 1477d4100351SChristoph Hellwig } 1478d4100351SChristoph Hellwig 1479d4100351SChristoph Hellwig static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, 1480d4100351SChristoph Hellwig void *data) 1481d4100351SChristoph Hellwig { 1482d4100351SChristoph Hellwig struct dm_zone *zone = data; 1483d4100351SChristoph Hellwig 1484d4100351SChristoph Hellwig clear_bit(DMZ_OFFLINE, &zone->flags); 1485d4100351SChristoph Hellwig clear_bit(DMZ_READ_ONLY, &zone->flags); 1486d4100351SChristoph Hellwig if (blkz->cond == BLK_ZONE_COND_OFFLINE) 1487d4100351SChristoph Hellwig set_bit(DMZ_OFFLINE, &zone->flags); 1488d4100351SChristoph Hellwig else if (blkz->cond == BLK_ZONE_COND_READONLY) 1489d4100351SChristoph Hellwig set_bit(DMZ_READ_ONLY, &zone->flags); 1490d4100351SChristoph Hellwig 1491d4100351SChristoph Hellwig if (dmz_is_seq(zone)) 1492d4100351SChristoph Hellwig zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); 1493d4100351SChristoph Hellwig else 1494d4100351SChristoph Hellwig zone->wp_block = 0; 1495d4100351SChristoph Hellwig return 0; 1496d4100351SChristoph Hellwig } 1497d4100351SChristoph Hellwig 14983b1a94c8SDamien Le Moal /* 14993b1a94c8SDamien Le Moal * Update a zone information. 15003b1a94c8SDamien Le Moal */ 15013b1a94c8SDamien Le Moal static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 15023b1a94c8SDamien Le Moal { 1503aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 1504bd976e52SDamien Le Moal unsigned int noio_flag; 15053b1a94c8SDamien Le Moal int ret; 15063b1a94c8SDamien Le Moal 1507bd5c4031SHannes Reinecke if (dev->flags & DMZ_BDEV_REGULAR) 1508bd5c4031SHannes Reinecke return 0; 1509bd5c4031SHannes Reinecke 1510bd976e52SDamien Le Moal /* 1511bd976e52SDamien Le Moal * Get zone information from disk. Since blkdev_report_zones() uses 1512bd976e52SDamien Le Moal * GFP_KERNEL by default for memory allocations, set the per-task 1513bd976e52SDamien Le Moal * PF_MEMALLOC_NOIO flag so that all allocations are done as if 1514bd976e52SDamien Le Moal * GFP_NOIO was specified. 1515bd976e52SDamien Le Moal */ 1516bd976e52SDamien Le Moal noio_flag = memalloc_noio_save(); 1517aa821c8dSHannes Reinecke ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1, 1518d4100351SChristoph Hellwig dmz_update_zone_cb, zone); 1519bd976e52SDamien Le Moal memalloc_noio_restore(noio_flag); 1520d4100351SChristoph Hellwig 1521d4100351SChristoph Hellwig if (ret == 0) 15227aedf75fSDamien Le Moal ret = -EIO; 1523d4100351SChristoph Hellwig if (ret < 0) { 1524aa821c8dSHannes Reinecke dmz_dev_err(dev, "Get zone %u report failed", 1525b7122873SHannes Reinecke zone->id); 1526aa821c8dSHannes Reinecke dmz_check_bdev(dev); 15273b1a94c8SDamien Le Moal return ret; 15283b1a94c8SDamien Le Moal } 15293b1a94c8SDamien Le Moal 15303b1a94c8SDamien Le Moal return 0; 15313b1a94c8SDamien Le Moal } 15323b1a94c8SDamien Le Moal 15333b1a94c8SDamien Le Moal /* 15343b1a94c8SDamien Le Moal * Check a zone write pointer position when the zone is marked 15353b1a94c8SDamien Le Moal * with the sequential write error flag. 15363b1a94c8SDamien Le Moal */ 15373b1a94c8SDamien Le Moal static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, 15383b1a94c8SDamien Le Moal struct dm_zone *zone) 15393b1a94c8SDamien Le Moal { 1540aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 15413b1a94c8SDamien Le Moal unsigned int wp = 0; 15423b1a94c8SDamien Le Moal int ret; 15433b1a94c8SDamien Le Moal 15443b1a94c8SDamien Le Moal wp = zone->wp_block; 15453b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 15463b1a94c8SDamien Le Moal if (ret) 15473b1a94c8SDamien Le Moal return ret; 15483b1a94c8SDamien Le Moal 1549aa821c8dSHannes Reinecke dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)", 1550b7122873SHannes Reinecke zone->id, zone->wp_block, wp); 15513b1a94c8SDamien Le Moal 15523b1a94c8SDamien Le Moal if (zone->wp_block < wp) { 15533b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 15543b1a94c8SDamien Le Moal wp - zone->wp_block); 15553b1a94c8SDamien Le Moal } 15563b1a94c8SDamien Le Moal 15573b1a94c8SDamien Le Moal return 0; 15583b1a94c8SDamien Le Moal } 15593b1a94c8SDamien Le Moal 15603b1a94c8SDamien Le Moal static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) 15613b1a94c8SDamien Le Moal { 15623b1a94c8SDamien Le Moal return &zmd->zones[zone_id]; 15633b1a94c8SDamien Le Moal } 15643b1a94c8SDamien Le Moal 15653b1a94c8SDamien Le Moal /* 15663b1a94c8SDamien Le Moal * Reset a zone write pointer. 15673b1a94c8SDamien Le Moal */ 15683b1a94c8SDamien Le Moal static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 15693b1a94c8SDamien Le Moal { 15703b1a94c8SDamien Le Moal int ret; 15713b1a94c8SDamien Le Moal 15723b1a94c8SDamien Le Moal /* 15733b1a94c8SDamien Le Moal * Ignore offline zones, read only zones, 15743b1a94c8SDamien Le Moal * and conventional zones. 15753b1a94c8SDamien Le Moal */ 15763b1a94c8SDamien Le Moal if (dmz_is_offline(zone) || 15773b1a94c8SDamien Le Moal dmz_is_readonly(zone) || 15783b1a94c8SDamien Le Moal dmz_is_rnd(zone)) 15793b1a94c8SDamien Le Moal return 0; 15803b1a94c8SDamien Le Moal 15813b1a94c8SDamien Le Moal if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { 1582aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 15833b1a94c8SDamien Le Moal 15846c1b1da5SAjay Joshi ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, 15853b1a94c8SDamien Le Moal dmz_start_sect(zmd, zone), 158636820560SHannes Reinecke zmd->zone_nr_sectors, GFP_NOIO); 15873b1a94c8SDamien Le Moal if (ret) { 15883b1a94c8SDamien Le Moal dmz_dev_err(dev, "Reset zone %u failed %d", 1589b7122873SHannes Reinecke zone->id, ret); 15903b1a94c8SDamien Le Moal return ret; 15913b1a94c8SDamien Le Moal } 15923b1a94c8SDamien Le Moal } 15933b1a94c8SDamien Le Moal 15943b1a94c8SDamien Le Moal /* Clear write error bit and rewind write pointer position */ 15953b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); 15963b1a94c8SDamien Le Moal zone->wp_block = 0; 15973b1a94c8SDamien Le Moal 15983b1a94c8SDamien Le Moal return 0; 15993b1a94c8SDamien Le Moal } 16003b1a94c8SDamien Le Moal 16013b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); 16023b1a94c8SDamien Le Moal 16033b1a94c8SDamien Le Moal /* 16043b1a94c8SDamien Le Moal * Initialize chunk mapping. 16053b1a94c8SDamien Le Moal */ 16063b1a94c8SDamien Le Moal static int dmz_load_mapping(struct dmz_metadata *zmd) 16073b1a94c8SDamien Le Moal { 16083b1a94c8SDamien Le Moal struct dm_zone *dzone, *bzone; 16093b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = NULL; 16103b1a94c8SDamien Le Moal struct dmz_map *dmap; 16113b1a94c8SDamien Le Moal unsigned int i = 0, e = 0, chunk = 0; 16123b1a94c8SDamien Le Moal unsigned int dzone_id; 16133b1a94c8SDamien Le Moal unsigned int bzone_id; 16143b1a94c8SDamien Le Moal 16153b1a94c8SDamien Le Moal /* Metadata block array for the chunk mapping table */ 16163b1a94c8SDamien Le Moal zmd->map_mblk = kcalloc(zmd->nr_map_blocks, 16173b1a94c8SDamien Le Moal sizeof(struct dmz_mblk *), GFP_KERNEL); 16183b1a94c8SDamien Le Moal if (!zmd->map_mblk) 16193b1a94c8SDamien Le Moal return -ENOMEM; 16203b1a94c8SDamien Le Moal 16213b1a94c8SDamien Le Moal /* Get chunk mapping table blocks and initialize zone mapping */ 16223b1a94c8SDamien Le Moal while (chunk < zmd->nr_chunks) { 16233b1a94c8SDamien Le Moal if (!dmap_mblk) { 16243b1a94c8SDamien Le Moal /* Get mapping block */ 16253b1a94c8SDamien Le Moal dmap_mblk = dmz_get_mblock(zmd, i + 1); 16263b1a94c8SDamien Le Moal if (IS_ERR(dmap_mblk)) 16273b1a94c8SDamien Le Moal return PTR_ERR(dmap_mblk); 16283b1a94c8SDamien Le Moal zmd->map_mblk[i] = dmap_mblk; 16293b1a94c8SDamien Le Moal dmap = (struct dmz_map *) dmap_mblk->data; 16303b1a94c8SDamien Le Moal i++; 16313b1a94c8SDamien Le Moal e = 0; 16323b1a94c8SDamien Le Moal } 16333b1a94c8SDamien Le Moal 16343b1a94c8SDamien Le Moal /* Check data zone */ 16353b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[e].dzone_id); 16363b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) 16373b1a94c8SDamien Le Moal goto next; 16383b1a94c8SDamien Le Moal 163936820560SHannes Reinecke if (dzone_id >= zmd->nr_zones) { 1640ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u", 16413b1a94c8SDamien Le Moal chunk, dzone_id); 16423b1a94c8SDamien Le Moal return -EIO; 16433b1a94c8SDamien Le Moal } 16443b1a94c8SDamien Le Moal 16453b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 16463b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 16473b1a94c8SDamien Le Moal dzone->chunk = chunk; 16483b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, dzone); 16493b1a94c8SDamien Le Moal 16503b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 16513b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 16523b1a94c8SDamien Le Moal else 16533b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 16543b1a94c8SDamien Le Moal 16553b1a94c8SDamien Le Moal /* Check buffer zone */ 16563b1a94c8SDamien Le Moal bzone_id = le32_to_cpu(dmap[e].bzone_id); 16573b1a94c8SDamien Le Moal if (bzone_id == DMZ_MAP_UNMAPPED) 16583b1a94c8SDamien Le Moal goto next; 16593b1a94c8SDamien Le Moal 166036820560SHannes Reinecke if (bzone_id >= zmd->nr_zones) { 1661ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u", 16623b1a94c8SDamien Le Moal chunk, bzone_id); 16633b1a94c8SDamien Le Moal return -EIO; 16643b1a94c8SDamien Le Moal } 16653b1a94c8SDamien Le Moal 16663b1a94c8SDamien Le Moal bzone = dmz_get(zmd, bzone_id); 16673b1a94c8SDamien Le Moal if (!dmz_is_rnd(bzone)) { 1668ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u", 16693b1a94c8SDamien Le Moal chunk, bzone_id); 16703b1a94c8SDamien Le Moal return -EIO; 16713b1a94c8SDamien Le Moal } 16723b1a94c8SDamien Le Moal 16733b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &bzone->flags); 16743b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 16753b1a94c8SDamien Le Moal bzone->chunk = chunk; 16763b1a94c8SDamien Le Moal bzone->bzone = dzone; 16773b1a94c8SDamien Le Moal dzone->bzone = bzone; 16783b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, bzone); 16793b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 16803b1a94c8SDamien Le Moal next: 16813b1a94c8SDamien Le Moal chunk++; 16823b1a94c8SDamien Le Moal e++; 16833b1a94c8SDamien Le Moal if (e >= DMZ_MAP_ENTRIES) 16843b1a94c8SDamien Le Moal dmap_mblk = NULL; 16853b1a94c8SDamien Le Moal } 16863b1a94c8SDamien Le Moal 16873b1a94c8SDamien Le Moal /* 16883b1a94c8SDamien Le Moal * At this point, only meta zones and mapped data zones were 16893b1a94c8SDamien Le Moal * fully initialized. All remaining zones are unmapped data 16903b1a94c8SDamien Le Moal * zones. Finish initializing those here. 16913b1a94c8SDamien Le Moal */ 169236820560SHannes Reinecke for (i = 0; i < zmd->nr_zones; i++) { 16933b1a94c8SDamien Le Moal dzone = dmz_get(zmd, i); 16943b1a94c8SDamien Le Moal if (dmz_is_meta(dzone)) 16953b1a94c8SDamien Le Moal continue; 16963b1a94c8SDamien Le Moal 16973b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 16983b1a94c8SDamien Le Moal zmd->nr_rnd++; 16993b1a94c8SDamien Le Moal else 17003b1a94c8SDamien Le Moal zmd->nr_seq++; 17013b1a94c8SDamien Le Moal 17023b1a94c8SDamien Le Moal if (dmz_is_data(dzone)) { 17033b1a94c8SDamien Le Moal /* Already initialized */ 17043b1a94c8SDamien Le Moal continue; 17053b1a94c8SDamien Le Moal } 17063b1a94c8SDamien Le Moal 17073b1a94c8SDamien Le Moal /* Unmapped data zone */ 17083b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 17093b1a94c8SDamien Le Moal dzone->chunk = DMZ_MAP_UNMAPPED; 17103b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) { 17113b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_rnd_list); 17123b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 17133b1a94c8SDamien Le Moal } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { 17143b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); 17153b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 17163b1a94c8SDamien Le Moal zmd->nr_seq--; 17173b1a94c8SDamien Le Moal } else { 17183b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_seq_list); 17193b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 17203b1a94c8SDamien Le Moal } 17213b1a94c8SDamien Le Moal } 17223b1a94c8SDamien Le Moal 17233b1a94c8SDamien Le Moal return 0; 17243b1a94c8SDamien Le Moal } 17253b1a94c8SDamien Le Moal 17263b1a94c8SDamien Le Moal /* 17273b1a94c8SDamien Le Moal * Set a data chunk mapping. 17283b1a94c8SDamien Le Moal */ 17293b1a94c8SDamien Le Moal static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, 17303b1a94c8SDamien Le Moal unsigned int dzone_id, unsigned int bzone_id) 17313b1a94c8SDamien Le Moal { 17323b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 17333b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 17343b1a94c8SDamien Le Moal int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; 17353b1a94c8SDamien Le Moal 17363b1a94c8SDamien Le Moal dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); 17373b1a94c8SDamien Le Moal dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); 17383b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, dmap_mblk); 17393b1a94c8SDamien Le Moal } 17403b1a94c8SDamien Le Moal 17413b1a94c8SDamien Le Moal /* 17423b1a94c8SDamien Le Moal * The list of mapped zones is maintained in LRU order. 17433b1a94c8SDamien Le Moal * This rotates a zone at the end of its map list. 17443b1a94c8SDamien Le Moal */ 17453b1a94c8SDamien Le Moal static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 17463b1a94c8SDamien Le Moal { 17473b1a94c8SDamien Le Moal if (list_empty(&zone->link)) 17483b1a94c8SDamien Le Moal return; 17493b1a94c8SDamien Le Moal 17503b1a94c8SDamien Le Moal list_del_init(&zone->link); 17513b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) { 17523b1a94c8SDamien Le Moal /* LRU rotate sequential zone */ 17533b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_seq_list); 17543b1a94c8SDamien Le Moal } else { 17553b1a94c8SDamien Le Moal /* LRU rotate random zone */ 17563b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_rnd_list); 17573b1a94c8SDamien Le Moal } 17583b1a94c8SDamien Le Moal } 17593b1a94c8SDamien Le Moal 17603b1a94c8SDamien Le Moal /* 17613b1a94c8SDamien Le Moal * The list of mapped random zones is maintained 17623b1a94c8SDamien Le Moal * in LRU order. This rotates a zone at the end of the list. 17633b1a94c8SDamien Le Moal */ 17643b1a94c8SDamien Le Moal static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 17653b1a94c8SDamien Le Moal { 17663b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone); 17673b1a94c8SDamien Le Moal if (zone->bzone) 17683b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone->bzone); 17693b1a94c8SDamien Le Moal } 17703b1a94c8SDamien Le Moal 17713b1a94c8SDamien Le Moal /* 17723b1a94c8SDamien Le Moal * Wait for any zone to be freed. 17733b1a94c8SDamien Le Moal */ 17743b1a94c8SDamien Le Moal static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) 17753b1a94c8SDamien Le Moal { 17763b1a94c8SDamien Le Moal DEFINE_WAIT(wait); 17773b1a94c8SDamien Le Moal 17783b1a94c8SDamien Le Moal prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); 17793b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 17803b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 17813b1a94c8SDamien Le Moal 17823b1a94c8SDamien Le Moal io_schedule_timeout(HZ); 17833b1a94c8SDamien Le Moal 17843b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 17853b1a94c8SDamien Le Moal dmz_lock_map(zmd); 17863b1a94c8SDamien Le Moal finish_wait(&zmd->free_wq, &wait); 17873b1a94c8SDamien Le Moal } 17883b1a94c8SDamien Le Moal 17893b1a94c8SDamien Le Moal /* 17903b1a94c8SDamien Le Moal * Lock a zone for reclaim (set the zone RECLAIM bit). 17913b1a94c8SDamien Le Moal * Returns false if the zone cannot be locked or if it is already locked 17923b1a94c8SDamien Le Moal * and 1 otherwise. 17933b1a94c8SDamien Le Moal */ 17943b1a94c8SDamien Le Moal int dmz_lock_zone_reclaim(struct dm_zone *zone) 17953b1a94c8SDamien Le Moal { 17963b1a94c8SDamien Le Moal /* Active zones cannot be reclaimed */ 17973b1a94c8SDamien Le Moal if (dmz_is_active(zone)) 17983b1a94c8SDamien Le Moal return 0; 17993b1a94c8SDamien Le Moal 18003b1a94c8SDamien Le Moal return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); 18013b1a94c8SDamien Le Moal } 18023b1a94c8SDamien Le Moal 18033b1a94c8SDamien Le Moal /* 18043b1a94c8SDamien Le Moal * Clear a zone reclaim flag. 18053b1a94c8SDamien Le Moal */ 18063b1a94c8SDamien Le Moal void dmz_unlock_zone_reclaim(struct dm_zone *zone) 18073b1a94c8SDamien Le Moal { 18083b1a94c8SDamien Le Moal WARN_ON(dmz_is_active(zone)); 18093b1a94c8SDamien Le Moal WARN_ON(!dmz_in_reclaim(zone)); 18103b1a94c8SDamien Le Moal 18113b1a94c8SDamien Le Moal clear_bit_unlock(DMZ_RECLAIM, &zone->flags); 18123b1a94c8SDamien Le Moal smp_mb__after_atomic(); 18133b1a94c8SDamien Le Moal wake_up_bit(&zone->flags, DMZ_RECLAIM); 18143b1a94c8SDamien Le Moal } 18153b1a94c8SDamien Le Moal 18163b1a94c8SDamien Le Moal /* 18173b1a94c8SDamien Le Moal * Wait for a zone reclaim to complete. 18183b1a94c8SDamien Le Moal */ 18193b1a94c8SDamien Le Moal static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) 18203b1a94c8SDamien Le Moal { 18213b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 18223b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 18233b1a94c8SDamien Le Moal wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); 18243b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 18253b1a94c8SDamien Le Moal dmz_lock_map(zmd); 18263b1a94c8SDamien Le Moal } 18273b1a94c8SDamien Le Moal 18283b1a94c8SDamien Le Moal /* 18293b1a94c8SDamien Le Moal * Select a random write zone for reclaim. 18303b1a94c8SDamien Le Moal */ 18313b1a94c8SDamien Le Moal static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd) 18323b1a94c8SDamien Le Moal { 18333b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 18343b1a94c8SDamien Le Moal struct dm_zone *zone; 18353b1a94c8SDamien Le Moal 18363b1a94c8SDamien Le Moal if (list_empty(&zmd->map_rnd_list)) 1837b234c6d7SDmitry Fomichev return ERR_PTR(-EBUSY); 18383b1a94c8SDamien Le Moal 18393b1a94c8SDamien Le Moal list_for_each_entry(zone, &zmd->map_rnd_list, link) { 18403b1a94c8SDamien Le Moal if (dmz_is_buf(zone)) 18413b1a94c8SDamien Le Moal dzone = zone->bzone; 18423b1a94c8SDamien Le Moal else 18433b1a94c8SDamien Le Moal dzone = zone; 18443b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(dzone)) 18453b1a94c8SDamien Le Moal return dzone; 18463b1a94c8SDamien Le Moal } 18473b1a94c8SDamien Le Moal 1848489dc0f0SHannes Reinecke return NULL; 18493b1a94c8SDamien Le Moal } 18503b1a94c8SDamien Le Moal 18513b1a94c8SDamien Le Moal /* 18523b1a94c8SDamien Le Moal * Select a buffered sequential zone for reclaim. 18533b1a94c8SDamien Le Moal */ 18543b1a94c8SDamien Le Moal static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) 18553b1a94c8SDamien Le Moal { 18563b1a94c8SDamien Le Moal struct dm_zone *zone; 18573b1a94c8SDamien Le Moal 18583b1a94c8SDamien Le Moal if (list_empty(&zmd->map_seq_list)) 1859e0702d90SDan Carpenter return ERR_PTR(-EBUSY); 18603b1a94c8SDamien Le Moal 18613b1a94c8SDamien Le Moal list_for_each_entry(zone, &zmd->map_seq_list, link) { 18623b1a94c8SDamien Le Moal if (!zone->bzone) 18633b1a94c8SDamien Le Moal continue; 18643b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(zone)) 18653b1a94c8SDamien Le Moal return zone; 18663b1a94c8SDamien Le Moal } 18673b1a94c8SDamien Le Moal 1868489dc0f0SHannes Reinecke return NULL; 18693b1a94c8SDamien Le Moal } 18703b1a94c8SDamien Le Moal 18713b1a94c8SDamien Le Moal /* 18723b1a94c8SDamien Le Moal * Select a zone for reclaim. 18733b1a94c8SDamien Le Moal */ 18743b1a94c8SDamien Le Moal struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd) 18753b1a94c8SDamien Le Moal { 18763b1a94c8SDamien Le Moal struct dm_zone *zone; 18773b1a94c8SDamien Le Moal 18783b1a94c8SDamien Le Moal /* 18793b1a94c8SDamien Le Moal * Search for a zone candidate to reclaim: 2 cases are possible. 18803b1a94c8SDamien Le Moal * (1) There is no free sequential zones. Then a random data zone 18813b1a94c8SDamien Le Moal * cannot be reclaimed. So choose a sequential zone to reclaim so 18823b1a94c8SDamien Le Moal * that afterward a random zone can be reclaimed. 18833b1a94c8SDamien Le Moal * (2) At least one free sequential zone is available, then choose 18843b1a94c8SDamien Le Moal * the oldest random zone (data or buffer) that can be locked. 18853b1a94c8SDamien Le Moal */ 18863b1a94c8SDamien Le Moal dmz_lock_map(zmd); 18873b1a94c8SDamien Le Moal if (list_empty(&zmd->reserved_seq_zones_list)) 18883b1a94c8SDamien Le Moal zone = dmz_get_seq_zone_for_reclaim(zmd); 18893b1a94c8SDamien Le Moal else 18903b1a94c8SDamien Le Moal zone = dmz_get_rnd_zone_for_reclaim(zmd); 18913b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 18923b1a94c8SDamien Le Moal 18933b1a94c8SDamien Le Moal return zone; 18943b1a94c8SDamien Le Moal } 18953b1a94c8SDamien Le Moal 18963b1a94c8SDamien Le Moal /* 18973b1a94c8SDamien Le Moal * Get the zone mapping a chunk, if the chunk is mapped already. 18983b1a94c8SDamien Le Moal * If no mapping exist and the operation is WRITE, a zone is 18993b1a94c8SDamien Le Moal * allocated and used to map the chunk. 19003b1a94c8SDamien Le Moal * The zone returned will be set to the active state. 19013b1a94c8SDamien Le Moal */ 19023b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) 19033b1a94c8SDamien Le Moal { 19043b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 19053b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 19063b1a94c8SDamien Le Moal int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; 19073b1a94c8SDamien Le Moal unsigned int dzone_id; 19083b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 19093b1a94c8SDamien Le Moal int ret = 0; 19103b1a94c8SDamien Le Moal 19113b1a94c8SDamien Le Moal dmz_lock_map(zmd); 19123b1a94c8SDamien Le Moal again: 19133b1a94c8SDamien Le Moal /* Get the chunk mapping */ 19143b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); 19153b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) { 19163b1a94c8SDamien Le Moal /* 19173b1a94c8SDamien Le Moal * Read or discard in unmapped chunks are fine. But for 19183b1a94c8SDamien Le Moal * writes, we need a mapping, so get one. 19193b1a94c8SDamien Le Moal */ 19203b1a94c8SDamien Le Moal if (op != REQ_OP_WRITE) 19213b1a94c8SDamien Le Moal goto out; 19223b1a94c8SDamien Le Moal 1923ad1bd578SDmitry Fomichev /* Allocate a random zone */ 19243b1a94c8SDamien Le Moal dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); 19253b1a94c8SDamien Le Moal if (!dzone) { 1926d0e21ce4SHannes Reinecke if (dmz_dev_is_dying(zmd)) { 192775d66ffbSDmitry Fomichev dzone = ERR_PTR(-EIO); 192875d66ffbSDmitry Fomichev goto out; 192975d66ffbSDmitry Fomichev } 19303b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 19313b1a94c8SDamien Le Moal goto again; 19323b1a94c8SDamien Le Moal } 19333b1a94c8SDamien Le Moal 19343b1a94c8SDamien Le Moal dmz_map_zone(zmd, dzone, chunk); 19353b1a94c8SDamien Le Moal 19363b1a94c8SDamien Le Moal } else { 19373b1a94c8SDamien Le Moal /* The chunk is already mapped: get the mapping zone */ 19383b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 19393b1a94c8SDamien Le Moal if (dzone->chunk != chunk) { 19403b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 19413b1a94c8SDamien Le Moal goto out; 19423b1a94c8SDamien Le Moal } 19433b1a94c8SDamien Le Moal 19443b1a94c8SDamien Le Moal /* Repair write pointer if the sequential dzone has error */ 19453b1a94c8SDamien Le Moal if (dmz_seq_write_err(dzone)) { 19463b1a94c8SDamien Le Moal ret = dmz_handle_seq_write_err(zmd, dzone); 19473b1a94c8SDamien Le Moal if (ret) { 19483b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 19493b1a94c8SDamien Le Moal goto out; 19503b1a94c8SDamien Le Moal } 19513b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); 19523b1a94c8SDamien Le Moal } 19533b1a94c8SDamien Le Moal } 19543b1a94c8SDamien Le Moal 19553b1a94c8SDamien Le Moal /* 19563b1a94c8SDamien Le Moal * If the zone is being reclaimed, the chunk mapping may change 19573b1a94c8SDamien Le Moal * to a different zone. So wait for reclaim and retry. Otherwise, 19583b1a94c8SDamien Le Moal * activate the zone (this will prevent reclaim from touching it). 19593b1a94c8SDamien Le Moal */ 19603b1a94c8SDamien Le Moal if (dmz_in_reclaim(dzone)) { 19613b1a94c8SDamien Le Moal dmz_wait_for_reclaim(zmd, dzone); 19623b1a94c8SDamien Le Moal goto again; 19633b1a94c8SDamien Le Moal } 19643b1a94c8SDamien Le Moal dmz_activate_zone(dzone); 19653b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 19663b1a94c8SDamien Le Moal out: 19673b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 19683b1a94c8SDamien Le Moal 19693b1a94c8SDamien Le Moal return dzone; 19703b1a94c8SDamien Le Moal } 19713b1a94c8SDamien Le Moal 19723b1a94c8SDamien Le Moal /* 19733b1a94c8SDamien Le Moal * Write and discard change the block validity of data zones and their buffer 19743b1a94c8SDamien Le Moal * zones. Check here that valid blocks are still present. If all blocks are 19753b1a94c8SDamien Le Moal * invalid, the zones can be unmapped on the fly without waiting for reclaim 19763b1a94c8SDamien Le Moal * to do it. 19773b1a94c8SDamien Le Moal */ 19783b1a94c8SDamien Le Moal void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) 19793b1a94c8SDamien Le Moal { 19803b1a94c8SDamien Le Moal struct dm_zone *bzone; 19813b1a94c8SDamien Le Moal 19823b1a94c8SDamien Le Moal dmz_lock_map(zmd); 19833b1a94c8SDamien Le Moal 19843b1a94c8SDamien Le Moal bzone = dzone->bzone; 19853b1a94c8SDamien Le Moal if (bzone) { 19863b1a94c8SDamien Le Moal if (dmz_weight(bzone)) 19873b1a94c8SDamien Le Moal dmz_lru_zone(zmd, bzone); 19883b1a94c8SDamien Le Moal else { 19893b1a94c8SDamien Le Moal /* Empty buffer zone: reclaim it */ 19903b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, bzone); 19913b1a94c8SDamien Le Moal dmz_free_zone(zmd, bzone); 19923b1a94c8SDamien Le Moal bzone = NULL; 19933b1a94c8SDamien Le Moal } 19943b1a94c8SDamien Le Moal } 19953b1a94c8SDamien Le Moal 19963b1a94c8SDamien Le Moal /* Deactivate the data zone */ 19973b1a94c8SDamien Le Moal dmz_deactivate_zone(dzone); 19983b1a94c8SDamien Le Moal if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) 19993b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 20003b1a94c8SDamien Le Moal else { 20013b1a94c8SDamien Le Moal /* Unbuffered inactive empty data zone: reclaim it */ 20023b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, dzone); 20033b1a94c8SDamien Le Moal dmz_free_zone(zmd, dzone); 20043b1a94c8SDamien Le Moal } 20053b1a94c8SDamien Le Moal 20063b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 20073b1a94c8SDamien Le Moal } 20083b1a94c8SDamien Le Moal 20093b1a94c8SDamien Le Moal /* 20103b1a94c8SDamien Le Moal * Allocate and map a random zone to buffer a chunk 20113b1a94c8SDamien Le Moal * already mapped to a sequential zone. 20123b1a94c8SDamien Le Moal */ 20133b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, 20143b1a94c8SDamien Le Moal struct dm_zone *dzone) 20153b1a94c8SDamien Le Moal { 20163b1a94c8SDamien Le Moal struct dm_zone *bzone; 20173b1a94c8SDamien Le Moal 20183b1a94c8SDamien Le Moal dmz_lock_map(zmd); 20193b1a94c8SDamien Le Moal again: 20203b1a94c8SDamien Le Moal bzone = dzone->bzone; 20213b1a94c8SDamien Le Moal if (bzone) 20223b1a94c8SDamien Le Moal goto out; 20233b1a94c8SDamien Le Moal 2024ad1bd578SDmitry Fomichev /* Allocate a random zone */ 20253b1a94c8SDamien Le Moal bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); 20263b1a94c8SDamien Le Moal if (!bzone) { 2027d0e21ce4SHannes Reinecke if (dmz_dev_is_dying(zmd)) { 202875d66ffbSDmitry Fomichev bzone = ERR_PTR(-EIO); 202975d66ffbSDmitry Fomichev goto out; 203075d66ffbSDmitry Fomichev } 20313b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 20323b1a94c8SDamien Le Moal goto again; 20333b1a94c8SDamien Le Moal } 20343b1a94c8SDamien Le Moal 20353b1a94c8SDamien Le Moal /* Update the chunk mapping */ 2036b7122873SHannes Reinecke dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id); 20373b1a94c8SDamien Le Moal 20383b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 20393b1a94c8SDamien Le Moal bzone->chunk = dzone->chunk; 20403b1a94c8SDamien Le Moal bzone->bzone = dzone; 20413b1a94c8SDamien Le Moal dzone->bzone = bzone; 20423b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 20433b1a94c8SDamien Le Moal out: 20443b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 20453b1a94c8SDamien Le Moal 20463b1a94c8SDamien Le Moal return bzone; 20473b1a94c8SDamien Le Moal } 20483b1a94c8SDamien Le Moal 20493b1a94c8SDamien Le Moal /* 20503b1a94c8SDamien Le Moal * Get an unmapped (free) zone. 20513b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 20523b1a94c8SDamien Le Moal */ 20533b1a94c8SDamien Le Moal struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) 20543b1a94c8SDamien Le Moal { 20553b1a94c8SDamien Le Moal struct list_head *list; 20563b1a94c8SDamien Le Moal struct dm_zone *zone; 20573b1a94c8SDamien Le Moal 20583b1a94c8SDamien Le Moal if (flags & DMZ_ALLOC_RND) 20593b1a94c8SDamien Le Moal list = &zmd->unmap_rnd_list; 20603b1a94c8SDamien Le Moal else 20613b1a94c8SDamien Le Moal list = &zmd->unmap_seq_list; 20623b1a94c8SDamien Le Moal again: 20633b1a94c8SDamien Le Moal if (list_empty(list)) { 20643b1a94c8SDamien Le Moal /* 20653b1a94c8SDamien Le Moal * No free zone: if this is for reclaim, allow using the 20663b1a94c8SDamien Le Moal * reserved sequential zones. 20673b1a94c8SDamien Le Moal */ 20683b1a94c8SDamien Le Moal if (!(flags & DMZ_ALLOC_RECLAIM) || 20693b1a94c8SDamien Le Moal list_empty(&zmd->reserved_seq_zones_list)) 20703b1a94c8SDamien Le Moal return NULL; 20713b1a94c8SDamien Le Moal 20723b1a94c8SDamien Le Moal zone = list_first_entry(&zmd->reserved_seq_zones_list, 20733b1a94c8SDamien Le Moal struct dm_zone, link); 20743b1a94c8SDamien Le Moal list_del_init(&zone->link); 20753b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_reserved_seq_zones); 20763b1a94c8SDamien Le Moal return zone; 20773b1a94c8SDamien Le Moal } 20783b1a94c8SDamien Le Moal 20793b1a94c8SDamien Le Moal zone = list_first_entry(list, struct dm_zone, link); 20803b1a94c8SDamien Le Moal list_del_init(&zone->link); 20813b1a94c8SDamien Le Moal 20823b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) 20833b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_rnd); 20843b1a94c8SDamien Le Moal else 20853b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_seq); 20863b1a94c8SDamien Le Moal 20873b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 2088ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u is offline", zone->id); 20893b1a94c8SDamien Le Moal zone = NULL; 20903b1a94c8SDamien Le Moal goto again; 20913b1a94c8SDamien Le Moal } 2092dc076c83SHannes Reinecke if (dmz_is_meta(zone)) { 2093dc076c83SHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 20943b1a94c8SDamien Le Moal 2095dc076c83SHannes Reinecke dmz_dev_warn(dev, "Zone %u has metadata", zone->id); 2096dc076c83SHannes Reinecke zone = NULL; 2097dc076c83SHannes Reinecke goto again; 2098dc076c83SHannes Reinecke } 20993b1a94c8SDamien Le Moal return zone; 21003b1a94c8SDamien Le Moal } 21013b1a94c8SDamien Le Moal 21023b1a94c8SDamien Le Moal /* 21033b1a94c8SDamien Le Moal * Free a zone. 21043b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 21053b1a94c8SDamien Le Moal */ 21063b1a94c8SDamien Le Moal void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 21073b1a94c8SDamien Le Moal { 21083b1a94c8SDamien Le Moal /* If this is a sequential zone, reset it */ 21093b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) 21103b1a94c8SDamien Le Moal dmz_reset_zone(zmd, zone); 21113b1a94c8SDamien Le Moal 21123b1a94c8SDamien Le Moal /* Return the zone to its type unmap list */ 21133b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) { 21143b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_rnd_list); 21153b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 21163b1a94c8SDamien Le Moal } else if (atomic_read(&zmd->nr_reserved_seq_zones) < 21173b1a94c8SDamien Le Moal zmd->nr_reserved_seq) { 21183b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); 21193b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 21203b1a94c8SDamien Le Moal } else { 21213b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_seq_list); 21223b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 21233b1a94c8SDamien Le Moal } 21243b1a94c8SDamien Le Moal 21253b1a94c8SDamien Le Moal wake_up_all(&zmd->free_wq); 21263b1a94c8SDamien Le Moal } 21273b1a94c8SDamien Le Moal 21283b1a94c8SDamien Le Moal /* 21293b1a94c8SDamien Le Moal * Map a chunk to a zone. 21303b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 21313b1a94c8SDamien Le Moal */ 21323b1a94c8SDamien Le Moal void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, 21333b1a94c8SDamien Le Moal unsigned int chunk) 21343b1a94c8SDamien Le Moal { 21353b1a94c8SDamien Le Moal /* Set the chunk mapping */ 2136b7122873SHannes Reinecke dmz_set_chunk_mapping(zmd, chunk, dzone->id, 21373b1a94c8SDamien Le Moal DMZ_MAP_UNMAPPED); 21383b1a94c8SDamien Le Moal dzone->chunk = chunk; 21393b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 21403b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 21413b1a94c8SDamien Le Moal else 21423b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 21433b1a94c8SDamien Le Moal } 21443b1a94c8SDamien Le Moal 21453b1a94c8SDamien Le Moal /* 21463b1a94c8SDamien Le Moal * Unmap a zone. 21473b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 21483b1a94c8SDamien Le Moal */ 21493b1a94c8SDamien Le Moal void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 21503b1a94c8SDamien Le Moal { 21513b1a94c8SDamien Le Moal unsigned int chunk = zone->chunk; 21523b1a94c8SDamien Le Moal unsigned int dzone_id; 21533b1a94c8SDamien Le Moal 21543b1a94c8SDamien Le Moal if (chunk == DMZ_MAP_UNMAPPED) { 21553b1a94c8SDamien Le Moal /* Already unmapped */ 21563b1a94c8SDamien Le Moal return; 21573b1a94c8SDamien Le Moal } 21583b1a94c8SDamien Le Moal 21593b1a94c8SDamien Le Moal if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { 21603b1a94c8SDamien Le Moal /* 21613b1a94c8SDamien Le Moal * Unmapping the chunk buffer zone: clear only 21623b1a94c8SDamien Le Moal * the chunk buffer mapping 21633b1a94c8SDamien Le Moal */ 2164b7122873SHannes Reinecke dzone_id = zone->bzone->id; 21653b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 21663b1a94c8SDamien Le Moal zone->bzone = NULL; 21673b1a94c8SDamien Le Moal 21683b1a94c8SDamien Le Moal } else { 21693b1a94c8SDamien Le Moal /* 21703b1a94c8SDamien Le Moal * Unmapping the chunk data zone: the zone must 21713b1a94c8SDamien Le Moal * not be buffered. 21723b1a94c8SDamien Le Moal */ 21733b1a94c8SDamien Le Moal if (WARN_ON(zone->bzone)) { 21743b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 21753b1a94c8SDamien Le Moal zone->bzone = NULL; 21763b1a94c8SDamien Le Moal } 21773b1a94c8SDamien Le Moal dzone_id = DMZ_MAP_UNMAPPED; 21783b1a94c8SDamien Le Moal } 21793b1a94c8SDamien Le Moal 21803b1a94c8SDamien Le Moal dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); 21813b1a94c8SDamien Le Moal 21823b1a94c8SDamien Le Moal zone->chunk = DMZ_MAP_UNMAPPED; 21833b1a94c8SDamien Le Moal list_del_init(&zone->link); 21843b1a94c8SDamien Le Moal } 21853b1a94c8SDamien Le Moal 21863b1a94c8SDamien Le Moal /* 21873b1a94c8SDamien Le Moal * Set @nr_bits bits in @bitmap starting from @bit. 21883b1a94c8SDamien Le Moal * Return the number of bits changed from 0 to 1. 21893b1a94c8SDamien Le Moal */ 21903b1a94c8SDamien Le Moal static unsigned int dmz_set_bits(unsigned long *bitmap, 21913b1a94c8SDamien Le Moal unsigned int bit, unsigned int nr_bits) 21923b1a94c8SDamien Le Moal { 21933b1a94c8SDamien Le Moal unsigned long *addr; 21943b1a94c8SDamien Le Moal unsigned int end = bit + nr_bits; 21953b1a94c8SDamien Le Moal unsigned int n = 0; 21963b1a94c8SDamien Le Moal 21973b1a94c8SDamien Le Moal while (bit < end) { 21983b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 21993b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 22003b1a94c8SDamien Le Moal /* Try to set the whole word at once */ 22013b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 22023b1a94c8SDamien Le Moal if (*addr == 0) { 22033b1a94c8SDamien Le Moal *addr = ULONG_MAX; 22043b1a94c8SDamien Le Moal n += BITS_PER_LONG; 22053b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 22063b1a94c8SDamien Le Moal continue; 22073b1a94c8SDamien Le Moal } 22083b1a94c8SDamien Le Moal } 22093b1a94c8SDamien Le Moal 22103b1a94c8SDamien Le Moal if (!test_and_set_bit(bit, bitmap)) 22113b1a94c8SDamien Le Moal n++; 22123b1a94c8SDamien Le Moal bit++; 22133b1a94c8SDamien Le Moal } 22143b1a94c8SDamien Le Moal 22153b1a94c8SDamien Le Moal return n; 22163b1a94c8SDamien Le Moal } 22173b1a94c8SDamien Le Moal 22183b1a94c8SDamien Le Moal /* 22193b1a94c8SDamien Le Moal * Get the bitmap block storing the bit for chunk_block in zone. 22203b1a94c8SDamien Le Moal */ 22213b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, 22223b1a94c8SDamien Le Moal struct dm_zone *zone, 22233b1a94c8SDamien Le Moal sector_t chunk_block) 22243b1a94c8SDamien Le Moal { 22253b1a94c8SDamien Le Moal sector_t bitmap_block = 1 + zmd->nr_map_blocks + 2226b7122873SHannes Reinecke (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) + 22273b1a94c8SDamien Le Moal (chunk_block >> DMZ_BLOCK_SHIFT_BITS); 22283b1a94c8SDamien Le Moal 22293b1a94c8SDamien Le Moal return dmz_get_mblock(zmd, bitmap_block); 22303b1a94c8SDamien Le Moal } 22313b1a94c8SDamien Le Moal 22323b1a94c8SDamien Le Moal /* 22333b1a94c8SDamien Le Moal * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. 22343b1a94c8SDamien Le Moal */ 22353b1a94c8SDamien Le Moal int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 22363b1a94c8SDamien Le Moal struct dm_zone *to_zone) 22373b1a94c8SDamien Le Moal { 22383b1a94c8SDamien Le Moal struct dmz_mblock *from_mblk, *to_mblk; 22393b1a94c8SDamien Le Moal sector_t chunk_block = 0; 22403b1a94c8SDamien Le Moal 22413b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 224236820560SHannes Reinecke while (chunk_block < zmd->zone_nr_blocks) { 22433b1a94c8SDamien Le Moal from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); 22443b1a94c8SDamien Le Moal if (IS_ERR(from_mblk)) 22453b1a94c8SDamien Le Moal return PTR_ERR(from_mblk); 22463b1a94c8SDamien Le Moal to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); 22473b1a94c8SDamien Le Moal if (IS_ERR(to_mblk)) { 22483b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 22493b1a94c8SDamien Le Moal return PTR_ERR(to_mblk); 22503b1a94c8SDamien Le Moal } 22513b1a94c8SDamien Le Moal 22523b1a94c8SDamien Le Moal memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); 22533b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, to_mblk); 22543b1a94c8SDamien Le Moal 22553b1a94c8SDamien Le Moal dmz_release_mblock(zmd, to_mblk); 22563b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 22573b1a94c8SDamien Le Moal 2258b3996295SDmitry Fomichev chunk_block += zmd->zone_bits_per_mblk; 22593b1a94c8SDamien Le Moal } 22603b1a94c8SDamien Le Moal 22613b1a94c8SDamien Le Moal to_zone->weight = from_zone->weight; 22623b1a94c8SDamien Le Moal 22633b1a94c8SDamien Le Moal return 0; 22643b1a94c8SDamien Le Moal } 22653b1a94c8SDamien Le Moal 22663b1a94c8SDamien Le Moal /* 22673b1a94c8SDamien Le Moal * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, 22683b1a94c8SDamien Le Moal * starting from chunk_block. 22693b1a94c8SDamien Le Moal */ 22703b1a94c8SDamien Le Moal int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 22713b1a94c8SDamien Le Moal struct dm_zone *to_zone, sector_t chunk_block) 22723b1a94c8SDamien Le Moal { 22733b1a94c8SDamien Le Moal unsigned int nr_blocks; 22743b1a94c8SDamien Le Moal int ret; 22753b1a94c8SDamien Le Moal 22763b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 227736820560SHannes Reinecke while (chunk_block < zmd->zone_nr_blocks) { 22783b1a94c8SDamien Le Moal /* Get a valid region from the source zone */ 22793b1a94c8SDamien Le Moal ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); 22803b1a94c8SDamien Le Moal if (ret <= 0) 22813b1a94c8SDamien Le Moal return ret; 22823b1a94c8SDamien Le Moal 22833b1a94c8SDamien Le Moal nr_blocks = ret; 22843b1a94c8SDamien Le Moal ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); 22853b1a94c8SDamien Le Moal if (ret) 22863b1a94c8SDamien Le Moal return ret; 22873b1a94c8SDamien Le Moal 22883b1a94c8SDamien Le Moal chunk_block += nr_blocks; 22893b1a94c8SDamien Le Moal } 22903b1a94c8SDamien Le Moal 22913b1a94c8SDamien Le Moal return 0; 22923b1a94c8SDamien Le Moal } 22933b1a94c8SDamien Le Moal 22943b1a94c8SDamien Le Moal /* 22953b1a94c8SDamien Le Moal * Validate all the blocks in the range [block..block+nr_blocks-1]. 22963b1a94c8SDamien Le Moal */ 22973b1a94c8SDamien Le Moal int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 22983b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 22993b1a94c8SDamien Le Moal { 23003b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 230136820560SHannes Reinecke unsigned int zone_nr_blocks = zmd->zone_nr_blocks; 23023b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 23033b1a94c8SDamien Le Moal unsigned int n = 0; 23043b1a94c8SDamien Le Moal 2305ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks", 2306b7122873SHannes Reinecke zone->id, (unsigned long long)chunk_block, 23073b1a94c8SDamien Le Moal nr_blocks); 23083b1a94c8SDamien Le Moal 23093b1a94c8SDamien Le Moal WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); 23103b1a94c8SDamien Le Moal 23113b1a94c8SDamien Le Moal while (nr_blocks) { 23123b1a94c8SDamien Le Moal /* Get bitmap block */ 23133b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 23143b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 23153b1a94c8SDamien Le Moal return PTR_ERR(mblk); 23163b1a94c8SDamien Le Moal 23173b1a94c8SDamien Le Moal /* Set bits */ 23183b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2319b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 23203b1a94c8SDamien Le Moal 23213b1a94c8SDamien Le Moal count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); 23223b1a94c8SDamien Le Moal if (count) { 23233b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 23243b1a94c8SDamien Le Moal n += count; 23253b1a94c8SDamien Le Moal } 23263b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 23273b1a94c8SDamien Le Moal 23283b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 23293b1a94c8SDamien Le Moal chunk_block += nr_bits; 23303b1a94c8SDamien Le Moal } 23313b1a94c8SDamien Le Moal 23323b1a94c8SDamien Le Moal if (likely(zone->weight + n <= zone_nr_blocks)) 23333b1a94c8SDamien Le Moal zone->weight += n; 23343b1a94c8SDamien Le Moal else { 2335ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u", 2336b7122873SHannes Reinecke zone->id, zone->weight, 23373b1a94c8SDamien Le Moal zone_nr_blocks - n); 23383b1a94c8SDamien Le Moal zone->weight = zone_nr_blocks; 23393b1a94c8SDamien Le Moal } 23403b1a94c8SDamien Le Moal 23413b1a94c8SDamien Le Moal return 0; 23423b1a94c8SDamien Le Moal } 23433b1a94c8SDamien Le Moal 23443b1a94c8SDamien Le Moal /* 23453b1a94c8SDamien Le Moal * Clear nr_bits bits in bitmap starting from bit. 23463b1a94c8SDamien Le Moal * Return the number of bits cleared. 23473b1a94c8SDamien Le Moal */ 23483b1a94c8SDamien Le Moal static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) 23493b1a94c8SDamien Le Moal { 23503b1a94c8SDamien Le Moal unsigned long *addr; 23513b1a94c8SDamien Le Moal int end = bit + nr_bits; 23523b1a94c8SDamien Le Moal int n = 0; 23533b1a94c8SDamien Le Moal 23543b1a94c8SDamien Le Moal while (bit < end) { 23553b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 23563b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 23573b1a94c8SDamien Le Moal /* Try to clear whole word at once */ 23583b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 23593b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 23603b1a94c8SDamien Le Moal *addr = 0; 23613b1a94c8SDamien Le Moal n += BITS_PER_LONG; 23623b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 23633b1a94c8SDamien Le Moal continue; 23643b1a94c8SDamien Le Moal } 23653b1a94c8SDamien Le Moal } 23663b1a94c8SDamien Le Moal 23673b1a94c8SDamien Le Moal if (test_and_clear_bit(bit, bitmap)) 23683b1a94c8SDamien Le Moal n++; 23693b1a94c8SDamien Le Moal bit++; 23703b1a94c8SDamien Le Moal } 23713b1a94c8SDamien Le Moal 23723b1a94c8SDamien Le Moal return n; 23733b1a94c8SDamien Le Moal } 23743b1a94c8SDamien Le Moal 23753b1a94c8SDamien Le Moal /* 23763b1a94c8SDamien Le Moal * Invalidate all the blocks in the range [block..block+nr_blocks-1]. 23773b1a94c8SDamien Le Moal */ 23783b1a94c8SDamien Le Moal int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 23793b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 23803b1a94c8SDamien Le Moal { 23813b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 23823b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 23833b1a94c8SDamien Le Moal unsigned int n = 0; 23843b1a94c8SDamien Le Moal 2385ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks", 2386b7122873SHannes Reinecke zone->id, (u64)chunk_block, nr_blocks); 23873b1a94c8SDamien Le Moal 238836820560SHannes Reinecke WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); 23893b1a94c8SDamien Le Moal 23903b1a94c8SDamien Le Moal while (nr_blocks) { 23913b1a94c8SDamien Le Moal /* Get bitmap block */ 23923b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 23933b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 23943b1a94c8SDamien Le Moal return PTR_ERR(mblk); 23953b1a94c8SDamien Le Moal 23963b1a94c8SDamien Le Moal /* Clear bits */ 23973b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2398b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 23993b1a94c8SDamien Le Moal 24003b1a94c8SDamien Le Moal count = dmz_clear_bits((unsigned long *)mblk->data, 24013b1a94c8SDamien Le Moal bit, nr_bits); 24023b1a94c8SDamien Le Moal if (count) { 24033b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 24043b1a94c8SDamien Le Moal n += count; 24053b1a94c8SDamien Le Moal } 24063b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 24073b1a94c8SDamien Le Moal 24083b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 24093b1a94c8SDamien Le Moal chunk_block += nr_bits; 24103b1a94c8SDamien Le Moal } 24113b1a94c8SDamien Le Moal 24123b1a94c8SDamien Le Moal if (zone->weight >= n) 24133b1a94c8SDamien Le Moal zone->weight -= n; 24143b1a94c8SDamien Le Moal else { 2415ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u", 2416b7122873SHannes Reinecke zone->id, zone->weight, n); 24173b1a94c8SDamien Le Moal zone->weight = 0; 24183b1a94c8SDamien Le Moal } 24193b1a94c8SDamien Le Moal 24203b1a94c8SDamien Le Moal return 0; 24213b1a94c8SDamien Le Moal } 24223b1a94c8SDamien Le Moal 24233b1a94c8SDamien Le Moal /* 24243b1a94c8SDamien Le Moal * Get a block bit value. 24253b1a94c8SDamien Le Moal */ 24263b1a94c8SDamien Le Moal static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, 24273b1a94c8SDamien Le Moal sector_t chunk_block) 24283b1a94c8SDamien Le Moal { 24293b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 24303b1a94c8SDamien Le Moal int ret; 24313b1a94c8SDamien Le Moal 243236820560SHannes Reinecke WARN_ON(chunk_block >= zmd->zone_nr_blocks); 24333b1a94c8SDamien Le Moal 24343b1a94c8SDamien Le Moal /* Get bitmap block */ 24353b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 24363b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 24373b1a94c8SDamien Le Moal return PTR_ERR(mblk); 24383b1a94c8SDamien Le Moal 24393b1a94c8SDamien Le Moal /* Get offset */ 24403b1a94c8SDamien Le Moal ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, 24413b1a94c8SDamien Le Moal (unsigned long *) mblk->data) != 0; 24423b1a94c8SDamien Le Moal 24433b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 24443b1a94c8SDamien Le Moal 24453b1a94c8SDamien Le Moal return ret; 24463b1a94c8SDamien Le Moal } 24473b1a94c8SDamien Le Moal 24483b1a94c8SDamien Le Moal /* 24493b1a94c8SDamien Le Moal * Return the number of blocks from chunk_block to the first block with a bit 24503b1a94c8SDamien Le Moal * value specified by set. Search at most nr_blocks blocks from chunk_block. 24513b1a94c8SDamien Le Moal */ 24523b1a94c8SDamien Le Moal static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, 24533b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks, 24543b1a94c8SDamien Le Moal int set) 24553b1a94c8SDamien Le Moal { 24563b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 24573b1a94c8SDamien Le Moal unsigned int bit, set_bit, nr_bits; 2458b3996295SDmitry Fomichev unsigned int zone_bits = zmd->zone_bits_per_mblk; 24593b1a94c8SDamien Le Moal unsigned long *bitmap; 24603b1a94c8SDamien Le Moal int n = 0; 24613b1a94c8SDamien Le Moal 246236820560SHannes Reinecke WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); 24633b1a94c8SDamien Le Moal 24643b1a94c8SDamien Le Moal while (nr_blocks) { 24653b1a94c8SDamien Le Moal /* Get bitmap block */ 24663b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 24673b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 24683b1a94c8SDamien Le Moal return PTR_ERR(mblk); 24693b1a94c8SDamien Le Moal 24703b1a94c8SDamien Le Moal /* Get offset */ 24713b1a94c8SDamien Le Moal bitmap = (unsigned long *) mblk->data; 24723b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2473b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zone_bits - bit); 24743b1a94c8SDamien Le Moal if (set) 2475b3996295SDmitry Fomichev set_bit = find_next_bit(bitmap, zone_bits, bit); 24763b1a94c8SDamien Le Moal else 2477b3996295SDmitry Fomichev set_bit = find_next_zero_bit(bitmap, zone_bits, bit); 24783b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 24793b1a94c8SDamien Le Moal 24803b1a94c8SDamien Le Moal n += set_bit - bit; 2481b3996295SDmitry Fomichev if (set_bit < zone_bits) 24823b1a94c8SDamien Le Moal break; 24833b1a94c8SDamien Le Moal 24843b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 24853b1a94c8SDamien Le Moal chunk_block += nr_bits; 24863b1a94c8SDamien Le Moal } 24873b1a94c8SDamien Le Moal 24883b1a94c8SDamien Le Moal return n; 24893b1a94c8SDamien Le Moal } 24903b1a94c8SDamien Le Moal 24913b1a94c8SDamien Le Moal /* 24923b1a94c8SDamien Le Moal * Test if chunk_block is valid. If it is, the number of consecutive 24933b1a94c8SDamien Le Moal * valid blocks from chunk_block will be returned. 24943b1a94c8SDamien Le Moal */ 24953b1a94c8SDamien Le Moal int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, 24963b1a94c8SDamien Le Moal sector_t chunk_block) 24973b1a94c8SDamien Le Moal { 24983b1a94c8SDamien Le Moal int valid; 24993b1a94c8SDamien Le Moal 25003b1a94c8SDamien Le Moal valid = dmz_test_block(zmd, zone, chunk_block); 25013b1a94c8SDamien Le Moal if (valid <= 0) 25023b1a94c8SDamien Le Moal return valid; 25033b1a94c8SDamien Le Moal 25043b1a94c8SDamien Le Moal /* The block is valid: get the number of valid blocks from block */ 25053b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, chunk_block, 250636820560SHannes Reinecke zmd->zone_nr_blocks - chunk_block, 0); 25073b1a94c8SDamien Le Moal } 25083b1a94c8SDamien Le Moal 25093b1a94c8SDamien Le Moal /* 25103b1a94c8SDamien Le Moal * Find the first valid block from @chunk_block in @zone. 25113b1a94c8SDamien Le Moal * If such a block is found, its number is returned using 25123b1a94c8SDamien Le Moal * @chunk_block and the total number of valid blocks from @chunk_block 25133b1a94c8SDamien Le Moal * is returned. 25143b1a94c8SDamien Le Moal */ 25153b1a94c8SDamien Le Moal int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, 25163b1a94c8SDamien Le Moal sector_t *chunk_block) 25173b1a94c8SDamien Le Moal { 25183b1a94c8SDamien Le Moal sector_t start_block = *chunk_block; 25193b1a94c8SDamien Le Moal int ret; 25203b1a94c8SDamien Le Moal 25213b1a94c8SDamien Le Moal ret = dmz_to_next_set_block(zmd, zone, start_block, 252236820560SHannes Reinecke zmd->zone_nr_blocks - start_block, 1); 25233b1a94c8SDamien Le Moal if (ret < 0) 25243b1a94c8SDamien Le Moal return ret; 25253b1a94c8SDamien Le Moal 25263b1a94c8SDamien Le Moal start_block += ret; 25273b1a94c8SDamien Le Moal *chunk_block = start_block; 25283b1a94c8SDamien Le Moal 25293b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, start_block, 253036820560SHannes Reinecke zmd->zone_nr_blocks - start_block, 0); 25313b1a94c8SDamien Le Moal } 25323b1a94c8SDamien Le Moal 25333b1a94c8SDamien Le Moal /* 25343b1a94c8SDamien Le Moal * Count the number of bits set starting from bit up to bit + nr_bits - 1. 25353b1a94c8SDamien Le Moal */ 25363b1a94c8SDamien Le Moal static int dmz_count_bits(void *bitmap, int bit, int nr_bits) 25373b1a94c8SDamien Le Moal { 25383b1a94c8SDamien Le Moal unsigned long *addr; 25393b1a94c8SDamien Le Moal int end = bit + nr_bits; 25403b1a94c8SDamien Le Moal int n = 0; 25413b1a94c8SDamien Le Moal 25423b1a94c8SDamien Le Moal while (bit < end) { 25433b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 25443b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 25453b1a94c8SDamien Le Moal addr = (unsigned long *)bitmap + BIT_WORD(bit); 25463b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 25473b1a94c8SDamien Le Moal n += BITS_PER_LONG; 25483b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 25493b1a94c8SDamien Le Moal continue; 25503b1a94c8SDamien Le Moal } 25513b1a94c8SDamien Le Moal } 25523b1a94c8SDamien Le Moal 25533b1a94c8SDamien Le Moal if (test_bit(bit, bitmap)) 25543b1a94c8SDamien Le Moal n++; 25553b1a94c8SDamien Le Moal bit++; 25563b1a94c8SDamien Le Moal } 25573b1a94c8SDamien Le Moal 25583b1a94c8SDamien Le Moal return n; 25593b1a94c8SDamien Le Moal } 25603b1a94c8SDamien Le Moal 25613b1a94c8SDamien Le Moal /* 25623b1a94c8SDamien Le Moal * Get a zone weight. 25633b1a94c8SDamien Le Moal */ 25643b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) 25653b1a94c8SDamien Le Moal { 25663b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 25673b1a94c8SDamien Le Moal sector_t chunk_block = 0; 25683b1a94c8SDamien Le Moal unsigned int bit, nr_bits; 256936820560SHannes Reinecke unsigned int nr_blocks = zmd->zone_nr_blocks; 25703b1a94c8SDamien Le Moal void *bitmap; 25713b1a94c8SDamien Le Moal int n = 0; 25723b1a94c8SDamien Le Moal 25733b1a94c8SDamien Le Moal while (nr_blocks) { 25743b1a94c8SDamien Le Moal /* Get bitmap block */ 25753b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 25763b1a94c8SDamien Le Moal if (IS_ERR(mblk)) { 25773b1a94c8SDamien Le Moal n = 0; 25783b1a94c8SDamien Le Moal break; 25793b1a94c8SDamien Le Moal } 25803b1a94c8SDamien Le Moal 25813b1a94c8SDamien Le Moal /* Count bits in this block */ 25823b1a94c8SDamien Le Moal bitmap = mblk->data; 25833b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2584b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 25853b1a94c8SDamien Le Moal n += dmz_count_bits(bitmap, bit, nr_bits); 25863b1a94c8SDamien Le Moal 25873b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 25883b1a94c8SDamien Le Moal 25893b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 25903b1a94c8SDamien Le Moal chunk_block += nr_bits; 25913b1a94c8SDamien Le Moal } 25923b1a94c8SDamien Le Moal 25933b1a94c8SDamien Le Moal zone->weight = n; 25943b1a94c8SDamien Le Moal } 25953b1a94c8SDamien Le Moal 25963b1a94c8SDamien Le Moal /* 25973b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 25983b1a94c8SDamien Le Moal */ 25993b1a94c8SDamien Le Moal static void dmz_cleanup_metadata(struct dmz_metadata *zmd) 26003b1a94c8SDamien Le Moal { 26013b1a94c8SDamien Le Moal struct rb_root *root; 26023b1a94c8SDamien Le Moal struct dmz_mblock *mblk, *next; 26033b1a94c8SDamien Le Moal int i; 26043b1a94c8SDamien Le Moal 26053b1a94c8SDamien Le Moal /* Release zone mapping resources */ 26063b1a94c8SDamien Le Moal if (zmd->map_mblk) { 26073b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_map_blocks; i++) 26083b1a94c8SDamien Le Moal dmz_release_mblock(zmd, zmd->map_mblk[i]); 26093b1a94c8SDamien Le Moal kfree(zmd->map_mblk); 26103b1a94c8SDamien Le Moal zmd->map_mblk = NULL; 26113b1a94c8SDamien Le Moal } 26123b1a94c8SDamien Le Moal 26133b1a94c8SDamien Le Moal /* Release super blocks */ 26143b1a94c8SDamien Le Moal for (i = 0; i < 2; i++) { 26153b1a94c8SDamien Le Moal if (zmd->sb[i].mblk) { 26163b1a94c8SDamien Le Moal dmz_free_mblock(zmd, zmd->sb[i].mblk); 26173b1a94c8SDamien Le Moal zmd->sb[i].mblk = NULL; 26183b1a94c8SDamien Le Moal } 26193b1a94c8SDamien Le Moal } 26203b1a94c8SDamien Le Moal 26213b1a94c8SDamien Le Moal /* Free cached blocks */ 26223b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_dirty_list)) { 26233b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_dirty_list, 26243b1a94c8SDamien Le Moal struct dmz_mblock, link); 2625ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)", 262633c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 26273b1a94c8SDamien Le Moal list_del_init(&mblk->link); 26283b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 26293b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 26303b1a94c8SDamien Le Moal } 26313b1a94c8SDamien Le Moal 26323b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list)) { 26333b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 26343b1a94c8SDamien Le Moal struct dmz_mblock, link); 26353b1a94c8SDamien Le Moal list_del_init(&mblk->link); 26363b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 26373b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 26383b1a94c8SDamien Le Moal } 26393b1a94c8SDamien Le Moal 26403b1a94c8SDamien Le Moal /* Sanity checks: the mblock rbtree should now be empty */ 26413b1a94c8SDamien Le Moal root = &zmd->mblk_rbtree; 26423b1a94c8SDamien Le Moal rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { 2643ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree", 264433c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 264533c2865fSDamien Le Moal mblk->ref = 0; 26463b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 26473b1a94c8SDamien Le Moal } 26483b1a94c8SDamien Le Moal 26493b1a94c8SDamien Le Moal /* Free the zone descriptors */ 26503b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 2651d5ffebddSMike Snitzer 2652d5ffebddSMike Snitzer mutex_destroy(&zmd->mblk_flush_lock); 2653d5ffebddSMike Snitzer mutex_destroy(&zmd->map_lock); 26543b1a94c8SDamien Le Moal } 26553b1a94c8SDamien Le Moal 2656ca1a7045SHannes Reinecke static void dmz_print_dev(struct dmz_metadata *zmd, int num) 2657ca1a7045SHannes Reinecke { 2658ca1a7045SHannes Reinecke struct dmz_dev *dev = &zmd->dev[num]; 2659ca1a7045SHannes Reinecke 2660bd5c4031SHannes Reinecke if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) 2661bd5c4031SHannes Reinecke dmz_dev_info(dev, "Regular block device"); 2662bd5c4031SHannes Reinecke else 2663ca1a7045SHannes Reinecke dmz_dev_info(dev, "Host-%s zoned block device", 2664ca1a7045SHannes Reinecke bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? 2665ca1a7045SHannes Reinecke "aware" : "managed"); 2666bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 2667bd5c4031SHannes Reinecke sector_t sector_offset = 2668bd5c4031SHannes Reinecke dev->zone_offset << zmd->zone_nr_sectors_shift; 2669bd5c4031SHannes Reinecke 2670bd5c4031SHannes Reinecke dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)", 2671bd5c4031SHannes Reinecke (u64)dev->capacity, (u64)sector_offset); 2672bd5c4031SHannes Reinecke dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)", 2673bd5c4031SHannes Reinecke dev->nr_zones, (u64)zmd->zone_nr_sectors, 2674bd5c4031SHannes Reinecke (u64)dev->zone_offset); 2675bd5c4031SHannes Reinecke } else { 2676ca1a7045SHannes Reinecke dmz_dev_info(dev, " %llu 512-byte logical sectors", 2677ca1a7045SHannes Reinecke (u64)dev->capacity); 2678ca1a7045SHannes Reinecke dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", 2679ca1a7045SHannes Reinecke dev->nr_zones, (u64)zmd->zone_nr_sectors); 2680ca1a7045SHannes Reinecke } 2681bd5c4031SHannes Reinecke } 2682ca1a7045SHannes Reinecke 26833b1a94c8SDamien Le Moal /* 26843b1a94c8SDamien Le Moal * Initialize the zoned metadata. 26853b1a94c8SDamien Le Moal */ 2686bd5c4031SHannes Reinecke int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, 2687bd5c4031SHannes Reinecke struct dmz_metadata **metadata, 26882234e732SHannes Reinecke const char *devname) 26893b1a94c8SDamien Le Moal { 26903b1a94c8SDamien Le Moal struct dmz_metadata *zmd; 2691b7122873SHannes Reinecke unsigned int i; 26923b1a94c8SDamien Le Moal struct dm_zone *zone; 26933b1a94c8SDamien Le Moal int ret; 26943b1a94c8SDamien Le Moal 26953b1a94c8SDamien Le Moal zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); 26963b1a94c8SDamien Le Moal if (!zmd) 26973b1a94c8SDamien Le Moal return -ENOMEM; 26983b1a94c8SDamien Le Moal 26992234e732SHannes Reinecke strcpy(zmd->devname, devname); 27003b1a94c8SDamien Le Moal zmd->dev = dev; 2701bd5c4031SHannes Reinecke zmd->nr_devs = num_dev; 27023b1a94c8SDamien Le Moal zmd->mblk_rbtree = RB_ROOT; 27033b1a94c8SDamien Le Moal init_rwsem(&zmd->mblk_sem); 27043b1a94c8SDamien Le Moal mutex_init(&zmd->mblk_flush_lock); 27053b1a94c8SDamien Le Moal spin_lock_init(&zmd->mblk_lock); 27063b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_lru_list); 27073b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_dirty_list); 27083b1a94c8SDamien Le Moal 27093b1a94c8SDamien Le Moal mutex_init(&zmd->map_lock); 27103b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_rnd, 0); 27113b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_rnd_list); 27123b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_rnd_list); 27133b1a94c8SDamien Le Moal 27143b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_seq, 0); 27153b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_seq_list); 27163b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_seq_list); 27173b1a94c8SDamien Le Moal 27183b1a94c8SDamien Le Moal atomic_set(&zmd->nr_reserved_seq_zones, 0); 27193b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); 27203b1a94c8SDamien Le Moal 27213b1a94c8SDamien Le Moal init_waitqueue_head(&zmd->free_wq); 27223b1a94c8SDamien Le Moal 27233b1a94c8SDamien Le Moal /* Initialize zone descriptors */ 27243b1a94c8SDamien Le Moal ret = dmz_init_zones(zmd); 27253b1a94c8SDamien Le Moal if (ret) 27263b1a94c8SDamien Le Moal goto err; 27273b1a94c8SDamien Le Moal 27283b1a94c8SDamien Le Moal /* Get super block */ 27293b1a94c8SDamien Le Moal ret = dmz_load_sb(zmd); 27303b1a94c8SDamien Le Moal if (ret) 27313b1a94c8SDamien Le Moal goto err; 27323b1a94c8SDamien Le Moal 27333b1a94c8SDamien Le Moal /* Set metadata zones starting from sb_zone */ 27343b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_meta_zones << 1; i++) { 2735735bd7e4SHannes Reinecke zone = dmz_get(zmd, zmd->sb[0].zone->id + i); 2736bd5c4031SHannes Reinecke if (!dmz_is_rnd(zone)) { 2737bd5c4031SHannes Reinecke dmz_zmd_err(zmd, 2738bd5c4031SHannes Reinecke "metadata zone %d is not random", i); 2739bd5c4031SHannes Reinecke ret = -ENXIO; 27403b1a94c8SDamien Le Moal goto err; 2741bd5c4031SHannes Reinecke } 27423b1a94c8SDamien Le Moal set_bit(DMZ_META, &zone->flags); 27433b1a94c8SDamien Le Moal } 2744bd5c4031SHannes Reinecke if (zmd->sb[2].zone) { 2745bd5c4031SHannes Reinecke zone = dmz_get(zmd, zmd->sb[2].zone->id); 2746bd5c4031SHannes Reinecke if (!zone) { 2747bd5c4031SHannes Reinecke dmz_zmd_err(zmd, 2748bd5c4031SHannes Reinecke "Tertiary metadata zone not present"); 2749bd5c4031SHannes Reinecke ret = -ENXIO; 2750bd5c4031SHannes Reinecke goto err; 2751bd5c4031SHannes Reinecke } 2752bd5c4031SHannes Reinecke set_bit(DMZ_META, &zone->flags); 2753bd5c4031SHannes Reinecke } 27543b1a94c8SDamien Le Moal /* Load mapping table */ 27553b1a94c8SDamien Le Moal ret = dmz_load_mapping(zmd); 27563b1a94c8SDamien Le Moal if (ret) 27573b1a94c8SDamien Le Moal goto err; 27583b1a94c8SDamien Le Moal 27593b1a94c8SDamien Le Moal /* 27603b1a94c8SDamien Le Moal * Cache size boundaries: allow at least 2 super blocks, the chunk map 27613b1a94c8SDamien Le Moal * blocks and enough blocks to be able to cache the bitmap blocks of 27623b1a94c8SDamien Le Moal * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow 27633b1a94c8SDamien Le Moal * the cache to add 512 more metadata blocks. 27643b1a94c8SDamien Le Moal */ 27653b1a94c8SDamien Le Moal zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; 27663b1a94c8SDamien Le Moal zmd->max_nr_mblks = zmd->min_nr_mblks + 512; 27673b1a94c8SDamien Le Moal zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; 27683b1a94c8SDamien Le Moal zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; 27693b1a94c8SDamien Le Moal zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; 27703b1a94c8SDamien Le Moal 27713b1a94c8SDamien Le Moal /* Metadata cache shrinker */ 27723b1a94c8SDamien Le Moal ret = register_shrinker(&zmd->mblk_shrinker); 27733b1a94c8SDamien Le Moal if (ret) { 2774ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Register metadata cache shrinker failed"); 27753b1a94c8SDamien Le Moal goto err; 27763b1a94c8SDamien Le Moal } 27773b1a94c8SDamien Le Moal 2778bd5c4031SHannes Reinecke dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version); 2779bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) 2780bd5c4031SHannes Reinecke dmz_print_dev(zmd, i); 27813b1a94c8SDamien Le Moal 2782ca1a7045SHannes Reinecke dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors", 2783ca1a7045SHannes Reinecke zmd->nr_zones, (u64)zmd->zone_nr_sectors); 2784ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u metadata zones", 2785ca1a7045SHannes Reinecke zmd->nr_meta_zones * 2); 2786ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u data zones for %u chunks", 2787ca1a7045SHannes Reinecke zmd->nr_data_zones, zmd->nr_chunks); 2788ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u random zones (%u unmapped)", 2789ca1a7045SHannes Reinecke zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); 2790ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)", 2791ca1a7045SHannes Reinecke zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); 2792ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u reserved sequential data zones", 2793ca1a7045SHannes Reinecke zmd->nr_reserved_seq); 2794ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "Format:"); 2795ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)", 27963b1a94c8SDamien Le Moal zmd->nr_meta_blocks, zmd->max_nr_mblks); 2797ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, " %u data zone mapping blocks", 27983b1a94c8SDamien Le Moal zmd->nr_map_blocks); 2799ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, " %u bitmap blocks", 28003b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks); 28013b1a94c8SDamien Le Moal 28023b1a94c8SDamien Le Moal *metadata = zmd; 28033b1a94c8SDamien Le Moal 28043b1a94c8SDamien Le Moal return 0; 28053b1a94c8SDamien Le Moal err: 28063b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 28073b1a94c8SDamien Le Moal kfree(zmd); 28083b1a94c8SDamien Le Moal *metadata = NULL; 28093b1a94c8SDamien Le Moal 28103b1a94c8SDamien Le Moal return ret; 28113b1a94c8SDamien Le Moal } 28123b1a94c8SDamien Le Moal 28133b1a94c8SDamien Le Moal /* 28143b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 28153b1a94c8SDamien Le Moal */ 28163b1a94c8SDamien Le Moal void dmz_dtr_metadata(struct dmz_metadata *zmd) 28173b1a94c8SDamien Le Moal { 28183b1a94c8SDamien Le Moal unregister_shrinker(&zmd->mblk_shrinker); 28193b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 28203b1a94c8SDamien Le Moal kfree(zmd); 28213b1a94c8SDamien Le Moal } 28223b1a94c8SDamien Le Moal 28233b1a94c8SDamien Le Moal /* 28243b1a94c8SDamien Le Moal * Check zone information on resume. 28253b1a94c8SDamien Le Moal */ 28263b1a94c8SDamien Le Moal int dmz_resume_metadata(struct dmz_metadata *zmd) 28273b1a94c8SDamien Le Moal { 28283b1a94c8SDamien Le Moal struct dm_zone *zone; 28293b1a94c8SDamien Le Moal sector_t wp_block; 28303b1a94c8SDamien Le Moal unsigned int i; 28313b1a94c8SDamien Le Moal int ret; 28323b1a94c8SDamien Le Moal 28333b1a94c8SDamien Le Moal /* Check zones */ 283436820560SHannes Reinecke for (i = 0; i < zmd->nr_zones; i++) { 28353b1a94c8SDamien Le Moal zone = dmz_get(zmd, i); 28363b1a94c8SDamien Le Moal if (!zone) { 2837ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Unable to get zone %u", i); 28383b1a94c8SDamien Le Moal return -EIO; 28393b1a94c8SDamien Le Moal } 28403b1a94c8SDamien Le Moal wp_block = zone->wp_block; 28413b1a94c8SDamien Le Moal 28423b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 28433b1a94c8SDamien Le Moal if (ret) { 2844ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Broken zone %u", i); 28453b1a94c8SDamien Le Moal return ret; 28463b1a94c8SDamien Le Moal } 28473b1a94c8SDamien Le Moal 28483b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 2849ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u is offline", i); 28503b1a94c8SDamien Le Moal continue; 28513b1a94c8SDamien Le Moal } 28523b1a94c8SDamien Le Moal 28533b1a94c8SDamien Le Moal /* Check write pointer */ 28543b1a94c8SDamien Le Moal if (!dmz_is_seq(zone)) 28553b1a94c8SDamien Le Moal zone->wp_block = 0; 28563b1a94c8SDamien Le Moal else if (zone->wp_block != wp_block) { 2857ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)", 28583b1a94c8SDamien Le Moal i, (u64)zone->wp_block, (u64)wp_block); 28593b1a94c8SDamien Le Moal zone->wp_block = wp_block; 28603b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 286136820560SHannes Reinecke zmd->zone_nr_blocks - zone->wp_block); 28623b1a94c8SDamien Le Moal } 28633b1a94c8SDamien Le Moal } 28643b1a94c8SDamien Le Moal 28653b1a94c8SDamien Le Moal return 0; 28663b1a94c8SDamien Le Moal } 2867